See also: Responsibility for the September 11 attacks, Hijackers in the September 11 attacks, Trials related to the September 11 attacks, and 20th hijacker Within hours of the attacks, the FBI was able to determine the names and in many cases the personal details of the suspected pilots and hijackers.[72][73] Mohamed Atta's
luggage, which did not make the connection from his Portland flight onto Flight 11, contained papers that revealed the identity of all 19 hijackers (all men), and other important clues about their plans, motives, and backgrounds.[74] On the day of the attacks, the National Security Agency intercepted communications that pointed to Osama bin Laden, as did German intelligence ag
encies.[75][76] On September 27, 2001, the FBI released photos of the 19 hijackers, along with information about the possible nationalities and aliases of many.[77] Fifteen
of the hijackers were from Saudi Arabia, two from the United Arab Emirates, one from Egypt, and one from Lebanon.[78] Mohamed Atta was the ringleader of the 19 hijackers.[79]
The hijackers were well-educated, mature adults, whose belief systems were fully formed.[80]
The FBI investigation into the attacks, code named operation PENTTBOM, was the largest and most complex investigation in the history of the FBI, involving over 7,000 special agents.[81] Through interrogations of USS Cole bombing suspects in Yemen, the FBI was able to link the hijackers to al-Qaeda
.[82] The United States government determined that al-Qaeda, headed by Osama bin Laden, bore responsibility for the attacks, with the FBI stating "evidence linking al-Qaeda and bin Laden to the attacks
of September 11 is clear and irrefutable".[83] The Government of the United Kingdom reached the same conclusion regarding al-Qaeda and Osama bin Laden's culpability for the September 11 attacks.[84]
Al-Qaeda
The origins of al-Qaeda can be traced back to 1979 when the Soviet Union invaded Afghanistan. Soon after the inv
asion, Osama bin Laden travele
d to Afghanistan where, with American government assistance,[85] he helped organize Arab mujahideen and established the Maktab al-Khidamat (MAK) organization to resist the Soviets. In 1989, as the Soviets withdrew, MAK was transformed into a "rapid reaction force" in jihad against governments across the Muslim world. Under the guidance of Ayman al-Zawahiri, Osama bin Laden became more radical.[86] In 1996, bin Laden issued his first fatwā, which called for American soldiers to leave Saudi Arabia.[87]
In a second fatwā issued in 1998, bin Laden outlined his objections to American foreign policy towards Israel, as well as the continu
ed presence of American troops in Saudi Arabia after the Gulf War.[88] Bin Laden used Islamic texts to exhort violent action against American military and citizenry until the s
tated grievances are reversed, noting "ulema have throughout Islamic history unanimously agreed that the jihad is an individual duty if the enemy destroys the Muslim countries."[88]
Planning of the attacks
The idea for the September 11 plot came from Khalid Sheikh Mohammed, who first presented the idea to Osama bin Laden in 1996.[89] At that point, Bin Laden and al-Qaeda were in a period of transition, having just relocated back to Afghanistan from Sudan.[90] The 1998 African Embassy bombings and Bin
Laden's 1998 fatwā marked a turning point, with bin Laden intent on attacking the United States.[90] In late 1998 or early 1999, bin Laden gave approval for Mohammed to go forward with organizing the plot. A series of meetings occurred in spring of 1999, involving Khalid Sheikh Mohammed, Osama bin Laden, and his deputy Mohammed Atef.[90] Mohammed provided operational support for the plot, including target selections and helping arra
nge travel for the hijackers.[90] Bin Laden overruled Mohammed, rejecting some potential targets such as the U.S. Bank Tower in Los Angeles[91] because "there was not enough time to prepare for such an operation".[92]
Bin Laden provided leadership for the plot, along with financial support, and was involved in selecting participants for the plot.[93] Bin Laden initially selected Nawaf al-Hazmi and Khalid al-Mihdhar, both experienced jihadists who fought in Bosnia. Hazmi and Mihdhar arrived in the United Stat
es in mid-January 2000, after traveling to Malaysia to attend the Kuala Lum
pur al-Qaeda Summit. In spring 2000, Hazmi and Mihdhar took flying lessons in San Diego, California, but both spoke little English, did not do well with flying lessons, and eventually served as "muscle" hijackers.[94][95] In late 1999, a group of men from Hamburg, Germany arrived in Afghanistan, including Mohamed Atta, Marwan al-Shehhi, Ziad Jarrah, and Ramzi Binalshibh.[96] Bin Laden selected these men for the plot, as they were educated, could speak English, and had experience living in the west.[97] New recruits were routinely screened for special skills, which allowed Al Qaeda leaders to also identify Hani Hanjour, who already had a commercial pilot's license, for the plot.[98]
Hanjour arrived in San Diego on December 8, 2000, joining Hazmi. They soon left for Arizona, where Hanjour took refresher training. Marwan a
l-Shehhi arrived at the end of May 2000, while Atta arrived on June 3, 2000, and Jarrah arrived on June 27, 2000. Binalshibh applied several times for a visa to the United States, but as a Yemeni, he was rejected out of concerns he would overstay his visa and remain as an illegal immigrant. Binalshibh remained in Hamburg, provi
ding coordination between Atta and Khalid Sheikh Mohammed. The three Hamburg cell members all took pilot training in south Florida. In spring 2001, the muscle hijackers began arriving in the United States.[99] In July 2001, Atta met with Binalshibh in Spain, where they coordinated details of the plot, including final target selection. Binalshibh also passed along Bin Laden's wish for the attacks to be carried out as soon as possible.[100]
Osama bin Laden
Main article: Videos of Osama bin Laden Osama bin Laden's declaration of a holy war against the United St
ates, and a fatwā signed by bin Laden and others calling for the killing of American civilians in 1998, are seen by investigators as evidence of his motivation to commit such acts.[101]
Bin Laden initially denied, but later admitted, involvement in the incidents.[2][102] On September 16, 2001, bin Laden denied any involvement with the attacks by reading a statement which was broadcast by Qatar's Al Jazeera
satellite channel: "I stress that I have not carried out this act, which appears to have been carried out by individuals with their own motivation."[103] This denial was broadcast on U.S. news networks and worldwide.
In November 2001, U.S. forces recovered a videotape from a destroyed house in Jalalabad, Afghanistan, in which Osama bin Laden is talking to Khal
ed al-Harbi. In the tape, bin Laden admits foreknowledge of the attacks.[104] The tape was broadcasted on various news networks from December 13, 2001. His distorted appearance on the tape has been attributed to tape transfer artifact.[105]
On December 27, 2001, a second bin Laden video was released. In the video, he states, "Terrorism against America deserves to be praised because it was a response to injustice, aimed at forcing America to stop its support for Israel, which kills our people", but he stopped short of admitting responsibility for the attacks.[106]
Shortly before the U.S. presidential election in 2004, in a taped statement, bin Laden publicly acknowledged al-Qaeda's involvement in the attacks on the U.S. and admitted his direct link to the attacks. He said that the attacks were carried out because "we are free...and want to regain freedom for our nation. As you undermine our security we undermine yours."[107] Osama bin Laden says he had personally directed the 19 hijackers.[108] In the video, he says, "We had agreed with the Commander-General Muhammad Atta, Allah have mercy on
him, that all the operations should be carried out within 20 minutes, before Bush and his administration notice."[102] Another video obtained by Al Jazeera in September 2006 shows Osama bin Laden with Ramzi Binalshibh, as well as two hijackers, Hamza al-Ghamdi and Wail al-Shehri, as they make preparations for the attacks.[109]
Khalid Sheikh Mohammed
The journalist Yosri Fouda of the Arabic television channel Al Jazeera reported that in April 2002, Khalid Sheikh Mohammed admitted his involvement, along with Ramzi Binalshibh, in the "Holy Tuesday operation".[110][111][112] The 9/11 Commission Report determined that the animosity towards the Un
ited States felt by Khalid Sheikh Mohammed, the "principal architect" of the 9/11 att
acks, stemmed "not from his experiences there as a student, but rather from his violent disagreement with U.S. foreign policy favoring Israel".[90] Mohamed Atta shared this same motivation. Ralph Bodenstein, a former classmate of Atta described him as "most imbued actually about... U.S. protection of these Israeli politics in the region".[113] Abdulaziz al-Omari, a hijacker aboard Flight 11 with Mohamed Atta, said in his video will, "My work is a message those who heard me and to all those who saw me at the same time it is a message to the infidels that you should leave the Arabian peninsula defeated and stop giving a hand of help to the coward Jews in Palestine."[114]
Khalid Sheikh Mohammed was also an adviser and financier of a
1993 bombing, also on the World Trade Center. He is also the uncle of Ramzi Yousef, the lead bomber in that attack.
Khalid Sheikh Mohammed was arrested on March 1, 2003 in Rawalpindi, Pakistan by Pakistani security officials working with the CIA, and is currently being held at Guantanamo Bay.[115] During US hearings in March 2007, which have been "widely criticized by lawyers and human rights groups as sham tribunals", Sheikh Mohammed again confessed his responsibility for the attacks, saying "I was responsible for the 9/11 operation, from A to Z."[116][112]
Other al-Qaeda members
In "Substitution for Testimony of Khalid Sheikh Mohammed" from the trial of Zacarias Moussaoui, five people are identified as having been completely aware of the operation's details. They are Osama bin Laden, Khalid Sheikh Mohammed, Ramzi Binalshibh, Abu Turab al-Urduni and Mohammed Atef.[117] To date, only peripheral figures have been tried or convicted in c
onnection with the attacks. Bin Laden has not yet been formally indicted for the attacks.[118]
On September 26, 2005, the Spanish high court directed by judge Baltasar Garzón sentenced Abu Dahdah to 27 years of imprisonment for conspiracy on the 9/11 attacks and being a member of the terrorist organization al-Qaeda. At the same time, another 17 al-Qaeda members were sentenced to penalties of between six and eleven years.[119][120] On February 16, 2006, the Spanish Supreme Court reduced the Abu Dahdah penalty to 12 years because it considered that his participation in the conspiracy was not proven.[121]
Motive
The attacks were consistent with the overall mission statement of al-Qaeda, as set out in a 1998 fatwā issued by Osama bin Laden, Ayman al-Zawahiri, Ahmed Refai Taha, Mir Hamzah, and Fazlur Rahman.[122][123][124] This statement begins by quoting the Koran as saying, "slay the pagans wherever ye find them" and extrapolates this to conclude that it is the "duty of every Muslim" to "kill Americans anywhere".[124] Bin Laden elaborated on this theme in his "Letter to America" of October 2002: "You are the worst civilization witnessed by the history of mankind: You ar
e the nation who, rather than ruling by the Shariah of Allah in its Constitution and Laws, choose to invent your own laws as you will and desire. You separate religion from your policies, contradicting the pure nature which affirms Absolute Authority to the Lord and your Creator."[125]
Many of the eventual findings of the 9/11 Commission with respect to motives have been supported by other experts. Counter-terrorism expert Richard A. Clarke explains in his 2004 book, Against All Enemies, that U.S. foreign policy decisions including "confronting Moscow in Afghanistan, inserting the U.S. military in the Persian Gulf", and "strengthening Israel as a base for a southern flank against the Soviets" contributed to al-Qaeda's motives.[126] Others, such as Jason Burke, foreign correspondent for The Observer, focus on a more political aspect to the motive, stating that "bin Laden is an activist with a very clear sense of what he wants and
how he hopes to achieve it. Those means may be far outside the norms of political activity [...] but his agenda is a basically political one."[127]
A variety of scholarship has also focused on bin Laden's overall strategy as a motive for the attacks. For instance, correspondent Peter Bergen argues that the attacks were part of a plan to cause the United States to increase its military and cultural presence in the Middle East, thereby forcing Muslims to confront the "evils" of a non-Muslim government and establish conservative Islamic governments in the region.[128] Michael Scott Doran, correspondent for Foreign Affairs, further emphasizes the "mythic" use of the term "spectacular" in bin Laden's response to the attacks, explaining that he was attempting to provoke a visceral reaction in the Middle East and ensure that Muslim citizens would react as violently as possible to an increase in U.S. involvement in their region.[129]
Aftermath
Immediate response
The 9/11 attacks had immediate and overwhelming effects upon
the American people.[130] Many police officers and rescue workers elsewhere in the country took leaves of absence to travel to New York City to assist in the process of recovering bodies from the twisted remnants of the Twin Towers.[131] Blood donations across the U.S. also saw a surge in the weeks after 9/11.[132][133] For the first time in history, SCATANA was invoked forcing all non-emergency civilian aircraft in the United States and several other countries including Canada to be immediately grounded, stranding tens of thousands of passengers across the world.[134] Any international flights were closed to American airspace by the Federal Aviation Administration, causing about five hun
dred flights to be turned back or redirected to other countries. Canada received 226 of the diverted flights and launched Operation Yellow Ribbon to deal with the large numbers of grounded planes and stranded passengers.[135]
Military operations following the attacks
The NATO council declared that the attacks on the United Stat
es were considered an attack on all NATO nations and, as such, satisfied Article 5 of the NATO charter.[136] Upon returning to Australia having been on an official visit to the US at the time of the attacks, Australian Prime Minister John Howard invoked Article IV of the ANZUS treaty. In the immediate aftermath of the attacks, the Bush administration announced a war on terrorism, with the stated goals of bringing Osama bin Laden and al-Qaeda to justice and preventing the emergence of other terrorist networks. These goals would be accomplished by means including economic and military sanctions against states perceived as harboring terrorists and increasing global surveillance and intelligence sharing. The second-biggest operation of the U.S. Global War on Terrorism outside of the United States, and the largest directly connected to terrorism, was the overthrow of the Taliban rule of Afghanistan by a U.S.-led coalition. The United States was not the only nation to increase its military readiness, with other notable examples being the Philippines and Indonesia, countries that have their own internal conflicts with
Islamic terrorism.[137][138] U.S. officials speculated on possible involvement of Saddam Hussein immediately afterwards.[139] Although these suspicions were unfounded, the association contributed to public acceptance for the 2003 invasion of Iraq.[139]
Domestic response
Following the attacks, President Bush's job approval rating soare
d to 90%.[140] On September 20, 2001, the U.S. president spoke before the nation and a joint session of the United States Congress, regarding the events of that day, the intervening nine days of rescue and recovery efforts, and his intent in response to those events. In addition, the highly visible role played by New York City mayor Rudy Giuliani won him high praise nationally and in New
York.[141] Many relief funds were immediately set up to assist victims of the attacks, with the task of providing financial assistance to the survivors of the attacks and to the families of victims, such as the Coalition of 9/11 Families. By the deadline for victim's compensation, September 11, 2003, 2,833 applications had been received from the families of those who were killed.[142]
Contingency plans for the continuity of government and the evacuation of leaders were also implemented almost immediately after the attacks.[134] Congress, however, was not told that the United States was under a continuity of government status until February 2002.[143] Within the United States, Congress passed and President Bush signed the Homeland Security Act of 2002, creating the Department of Homeland Security, representing the largest restructuring of the U.S. government in contemporary history. Congress also passed the USA PATRIOT Act, stating that it would help detect and prosecute terrorism and other crimes.[144] Civil liberties groups have criticized the PATRIOT Act, saying that it allows law enforcement to invade the privacy of citizens and eliminates judicial oversight of law-enforcement and domestic intelligence gathering.[145][146][147] The Bush Administration also invoked 9/11 as the reason to initiate a secret National Security Agency operation, "to eavesdrop on telephone and e-mail communications between the United States and people overseas without a warrant".[148]
Hate crimes
Numerous incidents of harassment and hate crimes were reported against Middle Easterners and other "Middle Eastern-looking" people in the days following the 9/11 attacks.[149][150] Sikhs were also targeted because Sikh males usually wear turbans, which are stereotypically associated with Muslims in the United States. There were reports of verbal abuse, attacks on mosques and other religious buildings (including the firebombing of a Hindu temple) and assaults on people, including one murder: Balbir Singh Sodhi was fatally shot on September 15, 2001. He, like others, was a Sikh who was mistaken for a Muslim.[149]
According to a study by Ball State University, people perceived to be Middle Eastern were as likely to be victims of hate crimes as followers of Islam during this time. The study also found a similar increase in hate crimes against people who may have been perceived as members of Islam, Arabs and others thought to be of Middle Eastern origin.[151]
Muslim American reaction
Top Muslim organizations in the United States were swift to condemn the attacks on 9/11 and called "upon Muslim Americans to come forward with their skills and resources to help alleviate the sufferings of the affected people and their families".[152] Top organizations include: Islamic Society of North America, American Muslim Alliance, American Muslim Council, Council on American-Islamic Relations, Islamic Circle of North America, and the Shari'a Scholars Association of North America. In addition to massive monetary donations, many Islamic organizations launched blood drives and provided medical assistance, food, and residence for victims.[153][154][155]
International response
The attacks were denounced by mainstream media and governments worldwide. Across the globe, nations offered pro-American support and solidarity.[156] Leaders in most Middle Eastern countries, and Afghanistan, condemned the attacks. Iraq was a notable exception, with an immediate official statement that "the American cowboys are reaping the fruit of their crimes against humanity".[157] Another publicized exception was the celebration of some Palestinians.[158]
Tens of thousands of people attempted to flee Afghanistan following the attacks, fearing a response by the United States. Pakistan, already home to many Afghan refugees from previous Afghan conflict, closed its border with Afghanistan on September 17. Approximately one month after the attacks, the United States led a broad coalition of international forces in the removal of the Taliban regime for harboring the al-Qaeda organization.[159] The Pakistani authorities moved decisively to align themselves with the United States in a war against the Taliban and al-Qaeda. Pakistan provided the United States a number of military airports and bases for its attack on the Taliban regime and arrested over 600 supposed al-Qaeda members, whom it handed over to the United States.[160]
Numerous countries, including the United Kingdom, India, Australia, France, Germany, Indonesia, China, Canada, Russia, Pakistan, Jordan, Mauritius, Uganda and Zimbabwe introduced "anti-terrorism" legislation and froze the bank accounts of businesses and individuals they suspected of having al-Qaeda ties.[161][162] Law enforcement and intelligence agencies in a number of countries, including Italy, Malaysia, Indonesia, and the Philippines arrested people they labeled terrorist suspects for the stated purpose of breaking up militant cells around the world.[163][164] In the U.S., this aroused some controversy, as critics such as the Bill of Rights Defense Committee argued that traditional restrictions on federal surveillance (e.g. COINTELPRO's monitoring of public meetings) were "dismantled" by the USA PATRIOT Act.[165] Organizations such as the American Civil Liberties Union and Liberty argued that certain civil rights protections were also being circumvented.[166][167]
The United States set up a detention center at Guantánamo Bay, Cuba, to hold what they termed "illegal enemy combatants". The legitimacy of these detentions has been questioned by, among others, the European Parliament, the Organization of American States, and Amnesty International.[168][169][170]
The international events and reactions immediately after the attacks had an effect on the impact of the World Conference against Racism 2001, which had ended in discord and international recriminations just three days before.[171]
Conspiracy theories
Proponents of conspiracy theories have suggested that individuals inside the United States possessed detailed information about the attacks and deliberately chose not to prevent them, or that individuals outside of al-Qaeda planned, carried out, or assisted in the attacks. Some conspiracy theorists claim the World Trade Center did not collapse because of the crashing planes but was demolished through the use of explosives.[172] This controlled demolition hypothesis is rejected by the National Institute of Standards and Technology and by the American Society of Civil Engineers, who, after their research, both concluded that the impacts of jets at high speeds in combination with subsequent fires caused the collapse of both Twin Towers.[173][174][175]
Long-term effects
Economic aftermath
Main article: Economic effects arising from the September 11 attacks The attacks had a significant economic impact on the United States and world markets.[176] The New York Stock Exchange (NYSE), the American Stock Exchange (AMEX), and NASDAQ did not open on September 11 and remained closed until September 17. When the stock markets reopened, the Dow Jones Industrial Average (DJIA) stock market index fell 684 points, or 7.1%, to 8921, a record-setting one-day point decline.[177] By the end of the week, the DJIA had fallen 1,369.7 points (14.3%), its largest one-week point drop in history, though later surpassed in 2008 during the global financial crisis.[178] U.S. stocks lost $1.4 trillion in value for the week.[178] This is equivalent to $1.69 trillion in present day terms.[179]
Economist and Crisis Consultant Randall Bell was retained by the city and state of New York to compute the economic damages to The World Trade Center site. He writes in his book, Strategy 360,[180] "The World Trade Center damages, estimated by the New York City Mayor's Office, were staggering: Clean up and stabilization of the WTC site - $9.0 billion; Repairing and replacing damaged infrastructure - $9.0 billion; Rebuilding the World Trade Center as smaller buildings - $6.7 billion; Repairing and restoring other damaged buildings - $5.3 billion; Lost rent of the destroyed buildings - $1.75 billion."
In New York City, about 430,000 job-months and $2.8 billion in wages were lost in the three months following the 9/11 attacks. The economic effects were mainly focused on the city's export economy sectors.[181] The city's GDP was estimated to have declined by $27.3 billion for the last three months of 2001 and all of 2002. The Federal government provided $11.2 billion in immediate assistance to the Government of New York City in September 2001, and $10.5 billion in early 2002 for economic development and infrastructure needs.[182]
The 9/11 attacks also hurt small businesses in Lower Manhattan near the World Trade Center, destroying or displacing about 18,000 of them. Assistance was provided by Small Business Administration loans and federal government Community Development Block Grants and Economic Injury Disaster Loans.[182] Some 31.9 million square feet of Lower Manhattan office space was damaged or destroyed.[183] Many wondered whether these jobs would return, and the damaged tax base recover.[184] Studies of the economic effects of 9/11 show that the Manhattan office real-estate market and office employment were less affected than initially expected because of the financial services industry's need for face-to-face interaction.[185][186]
North American air space was closed for several days after the attacks and air travel decreased upon its reopening, leading to nearly a 20% cutback in air travel capacity, and exacerbating financial problems in the struggling U.S. airline industry.[187]
Health effects
Main article: Health effects arising from the September 11 attacks The thousands of tons of toxic debris resulting from the collapse of the Twin Towers consisted of more than 2,500 contaminants, including known carcinogens.[188][189] This has led to debilitating illnesses among rescue and recovery workers, which many claim to be directly linked to debris exposure.[5][190] For example, NYPD Officer Frank Macri died of lung cancer that spread throughout his body on September 3, 2007; his family contends the cancer is the result of long hours on the site and they have filed for line-of-duty death benefits, which the city has yet to rule on.[191] Health effects have also extended to some residents, students, and office workers of Lower Manhattan and nearby Chinatown.[192] Several deaths have been linked to the toxic dust caused by the World Trade Center's collapse and the victims' names will be included in the World Trade Center memorial.[193] There is also scientific speculation that exposure to various toxic products in the air may have negative effects on fetal development. Due to this potential hazard, a notable children's environmental health center is currently analyzing the children whose mothers were pregnant during the WTC collapse, and were living or working near the World Trade Center towers.[194]
Legal disputes over the attendant costs of illnesses related to the attacks are still in the court system. On October 17, 2006, federal judge Alvin Hellerstein rejected New York City's refusal to pay for health costs for rescue workers, allowing for the possibility of numerous suits against the city.[195] Government officials have been faulted for urging the public to return to lower Manhattan in the weeks shortly following the attacks. Christine Todd Whitman, administrator of the EPA in the aftermath of the attacks, was heavily criticized for incorrectly saying that the area was environmentally safe.[196] President Bush was criticized for interfering with EPA interpretations and pronouncements regarding air quality in the aftermath of the attacks.[197] In addition, Mayor Giuliani was criticized for urging financial industry personnel to return quickly to the greater Wall Street area.[198]
Investigations
9/11 Commission
The National Commission on Terrorist Attacks Upon the United States (9/11 Commission), chaired by former New Jersey Governor Thomas Kean,[199] was formed in late 2002 to prepare a full and complete account of the circumstances surrounding the attacks, including preparedness for, and the immediate response to, the attacks. On July 22, 2004, the 9/11 Commission issued the 9/11 Commission Report. The commission and its report have been subject to various forms of criticism.[200][201]
Collapse of the World Trade Center
A federal technical building and fire safety investigation of the collapses of the Twin Towers and 7 WTC has been conducted by the United States Department of Commerce's National Institute of Standards and Technology (NIST). The goals of this investigation were to determine why the buildings collapsed, the extent of injuries and fatalities, and the procedures involved in designing and managing the World Trade Center.[202] The investigation into the collapse of 1 WTC and 2 WTC was concluded in October 2005, and the investigation into the collapse of 7 WTC concluded in August 2008.[203][204] The report concluded that the fireproofing on the Twin Towers' steel infrastructures was blown off by the initial impact of the planes and that, if this had not occurred, the towers would likely have remained standing.[205] This was confirmed by an independent study by Purdue University.[206]
W. Gene Corley, the director of the original investigation, commented that "the towers really did amazingly well. The terrorist aircraft didn’t bring the buildings down; it was the fire which followed. It was proven that you could take out two thirds of the columns in a tower and the building would still stand."[207] The fires weakened the trusses supporting the floors, making the floors sag. The sagging floors pulled on the exterior steel columns to the point where exterior columns bowed inward. With the damage to the core columns, the buckling exterior columns could no longer support the buildings, causing them to collapse. In addition, the report asserts that the towers' stairwells were not adequately reinforced to provide emergency escape for people above the impact zones.[208] NIST concluded that uncontrolled fires in 7 WTC caused floor beams and girders to heat and subsequently "caused a critical support column to fail, initiating a fire-induced progressive collapse that brought the building down".[204]
Internal review of the CIA
Excerpts from a previously classified CIA President's Daily Brief, dated August 6, 2001, that mentions uncorroborated reporting from a foreign intelligence service suggesting that Bin Laden may want to hijack an airplane to secure the release of Islamic extremist prisoners. The Inspector General of the CIA conducted an internal review of the CIA's pre-9/11 performance, and was harshly critical of senior CIA officials for not doing everything possible to confront terrorism, including failing to stop two of the 9/11 hijackers, Nawaf al-Hazmi and Khalid al-Mihdhar, as they entered the United States and failing to share information on the two men with the FBI.[209]
In May 2007, senators from both the Democratic Party and the Republican Party drafted legislation that would openly present an internal CIA investigative report. One of the backers, Senator Ron Wyden stated "The American people have a right to know what the Central Intelligence Agency was doing in those critical months before 9/11.... I am going to bulldog this until the public gets it." The report investigates the responsibilities of individual CIA personnel before and after the 9/11 attacks. The report was completed in 2005, but its details have never been released to the public.[210]
Rebuilding
On the day of the attacks, New York City mayor Rudy Giuliani proclaimed, "We will rebuild. We're going to come out of this stronger than before, politically stronger, economically stronger. The skyline will be made whole again."[211] The Lower Manhattan Development Corporation, tasked with coordinating rebuilding efforts at the World Trade Center site, was criticized for doing little with the enormous funding directed to the rebuilding efforts.[212][213] On the sites of the totally destroyed buildings, one, 7 World Trade Center, has a new office tower which was completed in 2006. The 1 World Trade Center is currently under construction at the site and at 1,776 ft (541 m) upon completion in 2011, will become the one of the tallest buildings in North America, behind the Chicago Spire and the CN Tower in Toronto.[214][215] Three more towers were expected to be built between 2007 and 2012 on the site, and will be located one block east of where the original towers stood. After the late-2000s recession, the site's owners said that construction of new towers could be delayed until 2036.[216] The damaged section of the Pentagon was rebuilt and occupied within a year of the attacks.[217]
Memorials
In the days immediately following the attacks, many memorials and vigils were held around the world.[218][219][220] In addition, pictures were placed all over Ground Zero. A witness described being unable to "get away from faces of innocent victims who were killed. Their pictures are everywhere, on phone booths, street lights, walls of subway stations. Everything reminded me of a huge funeral, people quiet and sad, but also very nice. Before, New York gave me a cold feeling; now people were reaching out to help each other.”[221]
One of the first memorials was the Tribute in Light, an installation of 88 searchlights at the footprints of the World Trade Center towers which projected two vertical columns of light into the sky.[222] In New York, the World Trade Center Site Memorial Competition was held to design an appropriate memorial on the site.[223] The winning design, Reflecting Absence, was selected in August 2006, and consists of a pair of reflecting pools in the footprints of the towers, surrounded by a list of the victims' names in an underground memorial space.[224] Plans for a museum on the site have been put on hold, following the abandonment of the International Freedom Center in reaction to complaints from the families of many victims.[225]
The Pentagon Memorial was completed and opened to the public on the seventh anniversary of the attacks, September 11, 2008.[226][227] It consists of a landscaped park with 184 benches facing the Pentagon.[228] When the Pentagon was repaired in 2001–2002, a private chapel and indoor memorial were included, located at the spot where Flight 77 crashed into the building.[229]
At Shanksville, a permanent Flight 93 National Memorial is planned to include a sculpted grove of trees forming a circle around the crash site, bisected by the plane's path, while wind chimes will bear the names of the victims.[230] A temporary memorial is located 500 yards (457 m) from the crash site.[231] New York City firefighters donated a memorial to the Shanksville Volunteer Fire Department. It is a cross made of steel from the World Trade Center and mounted atop a platform shaped like the Pentagon.[232] It was installed outside the firehouse on August 25, 2008.[233]
Many other permanent memorials are being constructed elsewhere, and scholarships and charities have been established by the victims' families, along with many other organizations and private figures.[234]
rorists hijacked four commercial passenger jet airliners.[1][2] The hijackers intentionally crashed two of the airliners into the Twin Towers of the World Trade Center in New York City, killing everyone on board and many others working in the buildings. Both buildings collapsed within two hours, destroying nearby buildings and damaging others. The hijackers crashed a third airliner into the Pentagon in Arlington, Virginia, just outside of Washington, D.C. The fourth plane crashed into a field near Shanksville in rural Pennsylvania, after some of its passengers and flight crew attempted to retake control of the plane, which the hijackers had redirected toward Washington, D.C. There were no survivors from any of the flights.
, including nationals of over 90 different countries. In addition, the death of at least one person from lung disease was ruled by a medical examiner to be a result of exposure to dust from the World Trade Center's collapse.[5]
ashed near Shanksville, Pennsylvania at 10:03 a.m, after the passengers on board engaged in a fight with the hijackers.[9][10]
the buildings, along with 18 people who were in the impact zone in the south tower.[43] 1,366 people died who were at or above the floors of impact in th
