Responsibility for the September 11 attacks
Osama bin Laden | |
|---|---|
| Occupation | Founder of al-Qaeda |
| Known for | Orchestrating the September 11 attacks |
At approximately 9:30 p.m. on September 11, 2001, George Tenet, then director of the Central Intelligence Agency (CIA), notified President George W. Bush and top officials that the CIA's Counterterrorism Center had pinpointed Osama bin Laden and al-Qaeda as the perpetrators behind the attacks. Within two weeks, the Federal Bureau of Investigation connected the hijackers to al-Qaeda, a transnational militant Salafist Islamist organization. High-ranking al-Qaeda operatives have publicly accepted responsibility for orchestrating the September 11 attacks through various recorded videos, audio messages, interviews, and printed declarations.
Identifying the hijackers
The FBI’s investigation, known as operation PENTTBOM, quickly identified the 19 hijackers due to their minimal efforts to conceal personal details across flight records, credit card transactions, and other documentation. By cross-referencing flight manifests with watch lists, customs officials rapidly compiled all nineteen names.
Information from passengers and crew was crucial during the hijackings. On American Airlines Flight 11, flight attendants Betty Ong and Madeline Amy Sweeney communicated with ground staff, specifying hijacker Mohamed Atta by seat location and physical description. A crew member aboard United Airlines Flight 175 reported that hijackers had killed the flight staff. Passengers and flight attendant Renee May on American Airlines Flight 77 provided details about the hijacking; ticket sellers later identified buyers as hijackers Hani Hanjour and Majed Moqed. During the seizure of United Airlines Flight 93, passenger Jeremy Glick described the assailants as Middle Eastern in appearance, armed with box cutters.
Luggage belonging to Mohamed Atta did not transfer from his Portland flight to American Airlines Flight 11. Inside this bag, authorities discovered a handwritten letter in Arabic, instructional flying videos, a fuel consumption calculator, a flight plan, a copy of the Quran, documents listing all nineteen hijackers’ identities, and Atta’s final will. The passport of hijacker Abdulaziz al-Omari was also recovered within this luggage. Additional handwritten notes were found both at the crash site of United Airlines Flight 93 and inside Nawaf al-Hazmi’s vehicle.
Investigators retrieved evidence from vehicles abandoned at airports, unclaimed baggage, and crash locations. A rental car parked at Boston’s Logan International Airport contained an Arabic flight manual along with papers from Huffman Aviation in Florida that revealed prior addresses of Atta and Marwan al-Shehhi in Hamburg, Germany. Nawaf al-Hazmi’s 1988 Toyota Corolla was located at Dulles International Airport; inside were maps of Washington, D.C., New York City, a cashier’s check for a Phoenix flight school, Boeing 757 cockpit diagrams, a box cutter-style knife, and various notes.
In New York City, authorities recovered a passport belonging to Satam al-Suqami before the World Trade Center towers collapsed; passports of two hijackers from Flight 93 were also found intact at that crash site.
On September 27, 2001, the FBI publicly released photographs of all nineteen hijackers along with details about their nationalities and known aliases.
Assigning responsibility
In the months following the September 11 attacks, no organization immediately claimed responsibility, leaving the hijackers— all deceased and silent— as the only known perpetrators. Media outlets quickly speculated about Osama bin Laden's involvement. On the day of the attacks, intercepted communications by the National Security Agency pointed toward bin Laden, a finding supported by intelligence from Germany. This evidence helped eliminate other potential suspects such as Croatian nationalist groups.
U.S. and British intelligence intercepted phone calls and monitored financial transactions that implicated Mohammed Atef, a deputy to bin Laden, as a significant figure in the attack’s planning. Conversations recorded days before September 11 referenced "an incident" in the United States and discussed its magnitude and consequences, though they did not specify exact targets.
Investigators connected the 19 hijackers to al-Qaeda through intelligence dossiers. The New York Times reported that authorities had identified accomplices and tracked their movements, with FBI agents swiftly investigating flight schools and neighborhoods in Florida. The Washington Post highlighted that investigators immediately examined hijacker files and pursued their associates right after the attacks.
Based on gathered evidence, U.S. officials promptly attributed sole responsibility to Osama bin Laden and al-Qaeda, dismissing other suspects. The British government agreed with this assessment. Although bin Laden initially denied involvement, he later accepted full responsibility in a 2004 video statement.
Author Laurie Mylroie suggested in 2006 that Khalid Sheikh Mohammed and his family were the main planners of 9/11, claiming al-Qaeda's involvement was opportunistic. In contrast, former CIA officer Robert Baer argued in 2007 that the Bush administration publicized Khalid Sheikh Mohammed’s confessions to create the impression that all principal perpetrators had been apprehended.
Al-Qaeda and Osama bin Laden
Intelligence agencies compiled a "short list" of top suspects possessing both motive and capability. Two passengers, Khalid al-Mihdhar and Nawaf al-Hazmi, were known al-Qaeda operatives already on the FBI terrorist watch list prior to 9/11. All hijackers were of Arab descent; none originated from Afghanistan. The scale, complexity, and secrecy of the attacks were consistent with al-Qaeda’s previous operations, such as the 1998 US embassy bombings that resulted in over 200 deaths.
1993 World Trade Center bombing
On February 26, 1993, Islamist terrorists detonated a urea nitrate-fuel oil car bomb inside the underground parking garage beneath Tower One of New York City's World Trade Center. The explosion killed six people and injured more than a thousand others. The attack aimed to cause the North Tower to collapse onto its twin.
The conspiracy involved individuals including Ramzi Yousef, Sheik Omar Abdel-Rahman, El Sayyid Nosair, Mahmud Abouhalima, Mohammad Salameh, Nidal Ayyad, Ahmad Ajaj, and Abdul Rahman Yasin. Funding came from al-Qaeda member Khalid Shaikh Mohammed, Yousef's uncle, who later reportedly confessed to orchestrating the September 11 attacks.
Statements of motives prior to attacks
Beginning in 1996, Osama bin Laden publicly articulated grievances that justified his declaration of war against the United States through fatwas and interviews with media outlets.
In 1998, bin Laden and Ayman al-Zawahiri jointly issued a fatwa on behalf of the World Islamic Front for Jihad Against Jews and Crusaders, which declared:
In a January 1999 interview with Time, bin Laden stated:
The Bush Administration summarized terrorist motives as "hatred of America," with President Bush remarking: "America was targeted for attack because we are the brightest beacon for freedom and opportunity in the world."
Bin Laden asserted in October 2001: "We swore that America wouldn't live in security until we live it truly in Palestine... America won't emerge from this crisis until it withdraws from the Arabian Peninsula and ceases its support for Israel."
A German acquaintance described Mohammed Atta as profoundly concerned about Israeli policies and U.S. backing of Israel. The Federal Bureau of Investigation identified al-Qaeda’s primary objective as expelling U.S. military forces from the Persian Gulf, especially Saudi Arabia.
Coordinating the attacks
Interrogations and interviews with al-Qaeda operatives Ramzi bin al-Shibh and Khalid Sheikh Mohammed, detained in 2002 and 2003 respectively, identified Khalid Sheikh Mohammed as the chief architect behind the attacks. Although bin al-Shibh was intended to act as a hijacker, he was unable to enter the United States.
Khalid Sheikh Mohammed had previously financed his nephew Ramzi Yousef’s involvement in the 1993 World Trade Center bombing and collaborated on the Oplan Bojinka conspiracy, which sought to bomb or hijack several aircraft. This plot, partially funded by Osama bin Laden, was disrupted in 1995 following an accidental fire.
By mid-1996, Khalid Sheikh Mohammed proposed a fresh scheme to al-Qaeda leaders involving hijacking multiple airplanes departing from both U.S. coasts. According to statements from bin al-Shibh and Khalid Sheikh Mohammed, six hijackers actively participated in planning, including four pilots alongside Khalid al-Mihdhar and Nawaf al-Hazmi. Despite CIA surveillance of these individuals within the United States, the FBI was not alerted, and the plot remained undetected.
During the 2006 trial of Zacarias Moussaoui, FBI officials conceded that there had been prior awareness of al-Qaeda’s intention to use aircraft as weapons against significant buildings. Philippine Chief Superintendent Avelino Razon recalled that during the investigation of Oplan Bojinka in 1995, authorities expected suicide attacks employing small planes loaded with explosives rather than large commercial jets.
The ultimate targets selected were the World Trade Center, the Pentagon, and the U.S. Capitol building; Flight 93 was designated for the Capitol. Initially excluded from plans, the White House was later added as a potential target. In coded communications, the Pentagon was referred to as Faculty of Arts, Capitol Hill as Faculty of Law, and the World Trade Center as Faculty of Town Planning.
Statements from al-Qaeda after the attacks
Al-Qaeda spokesperson Sulaiman Abu Ghaith appeared in an October 2001 video broadcast on Al Jazeera, delivering statements regarding the attacks:
Osama bin Laden’s declarations following the attacks
Prior to his death on May 2, 2011, Osama bin Laden was listed by the FBI among its "10 Most Wanted" due to involvement in incidents such as the USS Cole bombing and the 1998 United States embassy bombings in East Africa. Although the FBI's "FBI Most Wanted Terrorists" poster did not explicitly charge him with participation in 9/11, it identified him as a suspect linked to other international terrorist incidents. FBI spokesman Rex Tomb clarified this reflected legal procedures requiring formal charges before listing specific crimes. Bin Laden was officially charged for the 1998 embassy bombings but not for September 11. Subsequently, his connection to 9/11 was incorporated into FBI records.
Immediately following September 11, 2001, bin Laden praised the attacks while denying direct responsibility. In a statement aired on Al Jazeera on September 16, 2001, he asserted he had no role in planning the events and claimed restrictions imposed by Afghanistan's Taliban leadership limited his actions. The Taliban government also denied any involvement by bin Laden or access to external communications. In a September 28, 2001 interview published in Pakistan’s Ummat Karachi, bin Laden reiterated his non-involvement and condemned civilian casualties.
In late October 2001, journalist Tayseer Allouni conducted an interview with bin Laden that Al-Jazeera chose not to broadcast; their partnership with CNN ended after CNN aired it in January 2002. During this discussion, bin Laden portrayed the attacks as acts of self-defense against perceived aggression targeting Muslims:
In November 2001, U.S. forces recovered a videotape in Jalalabad featuring an individual believed to be bin Laden discussing operational details of planning the attacks. He outlined casualty expectations and training methods for operatives but withheld full disclosure of plans until deployment.
In May 2002, FBI Director Robert Mueller stated that no documentary evidence linking suspects to the September 11 plot had been found within intelligence gathered from either U.S. or Afghan sources.
A letter attributed to bin Laden emerged in November 2002 explaining motives behind September 11 as retaliation against ongoing Western hostility. The letter justified civilian targeting and articulated grievances along with demands directed at the United States while hinting at future assaults.
On February 11, 2003, Al Jazeera aired an audio recording purportedly featuring bin Laden.
Prior to the U.S. presidential election in 2004, bin Laden released a videotaped message openly acknowledging al-Qaeda’s responsibility for the attacks, framing them as resistance against oppression and a struggle for freedom.
In May 2006, an alleged audio message from bin Laden defended Zacarias Moussaoui—then on trial for alleged involvement in September 11—asserting that Moussaoui had no connection to those attacks and was not assigned to that mission.
Other al-Qaeda suspects
By 2004, individuals such as Mohammed, bin al-Shibh, and Mohammed al Qahtani, often called the "20th hijacker," were detained by the United States as unlawful combatants; however, none faced trial for the attacks at that time. In Germany, Mounir el-Motassadeq was initially found guilty of more than 3,000 counts of accessory to murder due to his financial support of the hijackers, but this conviction was later overturned, prompting a retrial. Similarly, Abdelghani Mzoudi was acquitted of comparable allegations.
Imam Anwar al-Awlaki has been associated with both Al-Qaeda and the 9/11 attackers, although he consistently denied such affiliations. Between 1998 and 1999, he held the position of vice president at the Charitable Society for Social Welfare (CSSW) in San Diego, an organization established by Abdul Majeed al-Zindani, who is listed on terrorism watchlists. The FBI characterized CSSW as a front organization channeling funds to terrorists supporting Osama bin Laden and Al-Qaeda. From 1999 to 2000, al-Awlaki was under investigation for potential fundraising activities for Hamas, connections to al-Qaeda, and links to associates of "the blind sheik," Omar Abdel-Rahman. He was also connected to Ziyad Khaleel, a procurement facilitator involved in acquiring satellite phones used in orchestrating the attacks. Nonetheless, authorities lacked sufficient evidence to pursue criminal charges.
During his tenure as an imam in San Diego, witnesses informed the FBI that al-Awlaki maintained close relationships with hijackers Nawaf al-Hazmi and Khalid al-Mihdhar, acting as their spiritual mentor. The 9/11 Commission Report indicated that these hijackers "reportedly respected [him] as a religious figure." They frequently attended his mosque services, where he conducted numerous private meetings with them, implying possible foreknowledge of the plot. Al-Awlaki departed San Diego around mid-2000 and traveled internationally thereafter.
In January 2001, he assumed the role of imam at the Dar Al-Hijrah mosque near Washington, DC, appointed by Esam Omeish. Fluent in English and noted for his oratory skills, he attracted a significant following among young non-Arabic speakers and wielded considerable influence. His sermons were attended by two additional hijackers (al-Hazmi again and Hani Hanjour) as well as Fort Hood shooter Nidal Malik Hasan. His phone number appeared among contacts seized during a Hamburg raid on Ramzi bin al-Shibh ("20th hijacker"). Representative Anna Eshoo described him as "more than a coincidental figure."
Shortly following the 9/11 attacks, al-Awlaki suggested that Israeli intelligence might have been behind the events and criticized the FBI’s profiling practices targeting Muslims.
On August 31, 2006, Yemeni officials arrested al-Awlaki along with five others; reports linked these arrests to accusations including kidnapping a Shiite teenager for ransom and involvement in an al-Qaeda scheme to abduct a U.S. military attaché. Al-Awlaki asserted that his detention resulted from U.S. pressure and was interviewed by FBI agents around September 2007 concerning 9/11 and other investigations. He was listed among 100 detainees whose release was demanded by militants affiliated with al-Qaeda in Yemen.
Initially regarded as a peripheral figure in relation to 9/11, al-Awlaki gained heightened attention after the 2009 Fort Hood shooting when it emerged that the perpetrator had communicated with him via email. Subsequently, he was linked to multiple terror plots across the United States, Canada, and the United Kingdom, including the attempted attack on Northwest Airlines Flight 253 carried out by his former student Umar Farouk Abdulmutallab.
Taliban
On October 4, 2001, British Prime Minister Tony Blair disclosed intelligence linking Osama bin Laden with the leadership of Afghanistan's Taliban and the terrorist network al-Qaeda. Prior to the 9/11 attacks, the Taliban had granted bin Laden refuge and were reportedly closely allied with al-Qaeda operatives. Following the attacks, Taliban foreign minister Wakil Ahmed Muttawakil condemned the events during an interview on Al Jazeera.
The United States demanded that the Taliban dismantle al-Qaeda camps, permit inspections, and hand over bin Laden. The Taliban declined these demands but proposed extraditing bin Laden to an Islamic nation for trial under Sharia law if evidence was presented. This stance followed earlier refusals to comply with U.S. requests after bin Laden was indicted for the 1998 United States embassy bombings in Kenya and Tanzania, citing a lack of sufficient proof.
Citing the Bush Doctrine, which asserts no distinction between terrorists and those who support them, the U.S. alongside Britain launched an invasion that toppled the Taliban regime in 2001. This military campaign utilized air strikes, special operations forces, and collaboration with the Northern Alliance.
On November 29, 2007, a videotape likely produced by the Central Intelligence Agency surfaced featuring bin Laden claiming full responsibility for 9/11 while denying any prior knowledge or involvement by the Taliban or Afghan authorities.
Financing the attacks
According to the 9/11 Commission Report, the financial resources used by the 9/11 conspirators ranged from $400,000 to $500,000 for planning and execution:
al-Qaeda financed the operatives. KSM [Khalid Sheikh Mohammad] supplied nearly all necessary funds covering travel, training, and living costs... The US government has not identified the precise source of these funds used in the 9/11 plot. Ultimately, this detail holds limited practical importance.
The report also found "no indication that any foreign government or official provided funding." Tracking these finances was hindered by traditional mechanisms such as zakat, a form of Muslim charitable giving, and hawala, an informal trust-based system for transferring money within family and regional networks.
Pakistan
In late 2001, reports from CNN and other media outlets revealed that Ahmed Omar Saeed (Syed) Sheikh, a long-standing Pakistani Inter-Services Intelligence (ISI) operative, wired $100,000 from the United Arab Emirates to lead hijacker Mohamed Atta.
Atta then allocated this money among co-conspirators in Florida. Sources indicated that Atta returned unused funds to Syed in the UAE shortly before September 11. Saeed was identified as a significant figure within al-Qaeda’s financial operations.
Following these revelations, Pakistan’s ISI chief Gen. Mahmood Ahmed was removed from his post. Indian media claimed that the FBI investigated whether Gen. Ahmed had instructed Saeed Sheikh to transfer $100,000 to Atta; Western media primarily attributed his dismissal to his ties with the Taliban.
The Wall Street Journal cited the Times of India, reporting that U.S. officials requested Gen. Ahmed’s removal after confirming his role in directing the transfer of $100,000 from Pakistan to hijacker Mohamed Atta through Ahmad Umar Sheikh.
Saudi Arabia
Accusations have emerged alleging that Saudi Arabia contributed financially to al-Qaeda and facilitated its expansion. Reports indicate that inquiries into al-Qaeda prior to 9/11 were hindered by interference at senior levels, including from Washington, which impacted investigations involving Saudi nationals. In June 2001, a US intelligence official informed BBC journalist Greg Palast that following the 2000 elections, agencies were directed to "ease off" probing the bin Laden family and Saudi royalty.
In May 2002, ex-FBI Agent Robert Wright, Jr. issued a public apology to the families of 9/11 victims, disclosing that his probe into al-Qaeda’s funding was intentionally obstructed by higher-ups. He later revealed to ABC’s Brian Ross that the FBI’s International Terrorism Unit’s lack of effectiveness impeded investigations into individuals such as Yasin al-Qadi, a Saudi businessman with considerable financial interests in Chicago. A month after the attacks, the US government designated al-Qadi as a global terrorist for channeling funds to Osama bin Laden through his Muwafaq Foundation.
By June 2009, relatives of those lost in 9/11 established Families United to Bankrupt Terrorism and initiated a civil lawsuit seeking to hold the Saudi royal family responsible for allegedly supporting al-Qaeda. Nonetheless, on June 29, 2009, the United States Supreme Court refused to review an appeal, invoking sovereign immunity as per a 1976 statute. Released documents failed to provide conclusive evidence directly connecting the royal family to 9/11; most links cited were circumstantial.
In February 2012, former U.S. senators Bob Graham and Bob Kerrey submitted sworn affidavits in federal court indicating potential Saudi government involvement in the attacks. Graham claimed a direct association between certain hijackers and Saudi officials, emphasizing unresolved questions regarding Saudi financial backing of al-Qaeda and the involvement of Omar al-Bayoumi—a Saudi linked to two hijackers and members of the Saudi government. A substantial amount of relevant documentation has yet to be made public.
On February 4, 2015, Zacarias Moussaoui, a former al-Qaeda member serving life imprisonment for his participation in 9/11, informed his attorneys that members of the Saudi royal family—including former intelligence chief Prince Turki al-Faisal Al Saud—provided support for al-Qaeda’s operations.
A Foreign Agents Registration Act disclosure in May 2017 revealed that the Royal Embassy of Saudi Arabia engaged Qorvis MSLGROUP to oversee efforts countering media narratives related to JASTA (Justice Against Sponsors of Terrorism Act) and allegations of Saudi complicity in 9/11. The agreement entailed organizing veteran delegations to Capitol Hill concerning JASTA and managing grassroots campaigns targeting media outlets such as CNN, The Wall Street Journal, and The Hill.
Bin Laden family
Despite the affluent bin Laden family publicly severing ties with Osama in 1994 following his purported involvement in terrorist acts like the 1993 World Trade Center bombing, connections between the bin Ladens and the Bush family came under scrutiny after 9/11. Claims have surfaced suggesting Osama was never completely disowned and that his relatives were aware of his activities prior to the attacks. Such associations have fueled conspiracy theories asserting that President George Bush had prior knowledge of Osama's actions and permitted the events of 9/11.
The documentary Fahrenheit 9/11 draws attention to business relationships linking the Bush and bin Laden families, noting Salem bin Laden’s investment in Arbusto Energy—a company managed by George W. Bush—through intermediary James R. Bath. Members of the Bush family also hold investments in the Carlyle Group, an investment firm and defense contractor with interests in Saudi Arabia and ties to the Saudi Binladen Group, formerly overseen by ex-Secretary of Defense Frank Carlucci. On September 10, 2001, former President George H. W. Bush along with cabinet officials attended a Carlyle Group conference at the Ritz-Carlton near the Pentagon featuring Shafig bin Laden—Osama’s half-brother—with proceedings continuing during the Pentagon attack. George H. W. Bush maintained an advisory role with Carlyle for two years following 9/11.
According to The New York Times, members of the bin Laden family were escorted under FBI supervision first to a confidential location in Texas and then Washington before departing the US on private charter flights days after the attacks. The 9/11 Commission deemed FBI screening procedures for departing Saudi nationals adequate, with approval from advisor Richard Clarke following concerns expressed by Saudi authorities regarding their citizens’ safety. In 2007, Judicial Watch published FBI documents implying Osama bin Laden may have booked one such flight; its president criticized the FBI’s investigation as "slapdash."
Steve Coll’s 2008 book The bin Ladens: An Arabian Family in the American Century notes that most family members had limited acquaintance with Osama. Richard Clarke observed this aligns with cultural practices of Muslim men having multiple wives during that period and speculated that extensive prior knowledge about the bin Ladens may explain why FBI agents did not interrogate them before or after their departure from the country.
Iraq
In the immediate aftermath of the attacks, speculation arose regarding Iraq's potential involvement. While Iraqi state-controlled media lauded the attacks, they denied any direct participation. In September 2003, President Bush affirmed, "we have found no evidence linking Saddam Hussein to the events of September 11."
On June 29, 2005, Republican Congressman Robin Hayes asserted that "the evidence clearly indicates" Saddam Hussein's role in 9/11. However, Senator John McCain countered by stating, "I have not encountered convincing proof supporting that claim." The 9/11 Commission Report determined there was "no credible evidence" of collaboration between Saddam's regime and al-Qaeda in planning attacks against the United States. Furthermore, in September 2006, the Senate Select Committee on Intelligence concluded there was no proof of prewar connections between Saddam Hussein and al-Qaeda or any foreknowledge of the September 11 attacks.
Despite these official conclusions, certain opinion polls reveal that a notable minority of Americans believe Saddam Hussein was "personally involved." This perspective was notably promoted by investigative journalist Jayna Davis in her book The Third Terrorist, which links Hussein to the Oklahoma City Bombing, and was also discussed in a 2002 op-ed published by the Wall Street Journal.
Iran
The 1998 U.S. indictment against bin Laden highlighted that al-Qaeda had "formed alliances ... with the government of Iran and its affiliated terrorist organization Hezbollah to target mutual adversaries." By 2001, officials reported Iranian authorities facilitated advanced weapons and explosives training for al-Qaeda operatives in Lebanon.
According to the 9/11 Commission Report, between eight and ten hijackers transited through Iran with assistance from Iranian border personnel. The report also referenced "circumstantial evidence" indicating senior Hezbollah members monitored some hijackers' movements into Iran during late 2000. In the case Havlish, et al. v. Osama bin Laden, Iran, et al., Judge George B. Daniels held Iran legally accountable for providing "material support" to the perpetrators of 9/11. The judgment cited allegations that Iran employed front companies to procure a Boeing flight simulator for terrorist training and that Iranian officials possessed prior knowledge of the planned attacks. These claims were further supported by defectors from Iran's intelligence services.
Conversely, the 9/11 Commission found no proof that either Iran or Hezbollah had awareness of the specific operational planning for the attacks. Key al-Qaeda figures denied any affiliation with Hezbollah or any ulterior motives related to their travel through Iran beyond exploiting lenient passport controls.
United States advance knowledge
The 9/11 Commission Report concluded that Presidents Bill Clinton and George W. Bush were inadequately supported by intelligence agencies such as the FBI and CIA before September 11. It also identified deficiencies in military response protocols and operational shortcomings in emergency management.
Following the attacks, officials within the Bush Administration asserted that no government entity had anticipated airplanes being used as missiles. FBI Director Robert Mueller stated he was unaware of any warning signs preceding the event.
The 9/11 Commission Report described the attacks as a shock but not entirely unexpected, noting that Islamic extremist groups had issued warnings beforehand. During spring and summer 2001, U.S. intelligence agencies received numerous alerts about an impending al-Qaeda assault; Director of Central Intelligence George Tenet characterized these warnings as "blinking red." These came from both domestic and international intelligence sources.
Condoleezza Rice testified that threat intelligence in 2001 lacked specific details regarding timing, location, or method of attack and primarily concerned al-Qaeda activities overseas. The August 6, 2001 President's Daily Brief titled Bin Ladin Determined To Strike in US cautioned about bin Laden’s intent to exploit operatives’ access within the United States for an attack, referencing suspicious FBI information consistent with hijacking preparations.
The 9/11 Commission Report identified multiple missed opportunities attributed to systemic failures:
- Failure to place future hijackers al-Hazmi and al-Mihdhar on watchlists or monitor them following their travel to Bangkok, as well as not notifying the FBI;
- Lack of connection between individuals involved in the Cole bombing and al-Mihdhar;
- Inability to locate al-Mihdhar or al-Hazmi promptly upon their arrival in the U.S.;
- Failure to associate Zacarias Moussaoui’s arrest—linked to flight training for terrorist purposes—with heightened threat alerts;
- Overlooking false statements on visa applications and fraudulent passports;
- Neglecting to expand no-fly lists with names from terrorist watchlists;
- Not screening passengers flagged by CAPPS (Computer-Assisted Passenger Prescreening System);
- Failing to reinforce cockpit doors or prepare for suicide hijackings.
Regarding air defense shortcomings, the Report states:
Protocols existing on September 11 were ill-suited for dealing with hijacked aircraft used as weapons. What ensued was an ad hoc defense orchestrated by civilians inexperienced with such threats alongside a military unprepared for commercial airplanes being utilized as weapons of mass destruction.
Emergency response efforts were similarly "necessarily improvised," revealing gaps in disaster preparedness, absence of unified incident command structures, and insufficient interagency communication. At the Pentagon specifically, issues with command and control became apparent.
See also
References
Further reading
- 1000 YEARS FOR REVENGE: International Terrorism and the FBI authored by Peter Lance (2003). This work explores al-Qaeda’s plans, underlying motivations, and the difficulties faced by the FBI in their pre-9/11 investigations.