On December 4, 1998, an item in President Clinton’s Presidential Daily Briefing (PDB) is titled, “Bin Laden Preparing to Hijack US Aircraft and Other Attacks.” The PDB says “Bin Laden and is allies are preparing for attacks in the US, including an aircraft hijacking to obtain the release of Sheikh Omar Abdul-Rahman, Ramzi Yousef, and Muhammad Sadiq ‘Awda. One source quoted a senior member of Al-Gama’a al-Islamiyya (IG) saying that, as of late October, the IG had completed planning for an operation in the US on behalf of bin Laden, but that the operation was on hold. A senior bin Laden operative from Saudi Arabia was to visit IG counterparts in the US soon thereafter to discuss options-perhaps including an aircraft hijacking.” The same source says bin Laden may implement plans to hijack US aircraft before the start of the Muslim holy month of Ramadan on December 20 and that two members of the operational team had evaded security checks in a recent trial run at a New York airport. A possible different source says that in late September, Mohammed Shawqui Islambouli, brother of the assassin of Egyptian President Anwar Sadat and described in the PDB as an IG leader, was planning to hijack a US airliner during the “next couple of weeks” to free Abdul-Rahman and other prisoners. The PDB also says that “some members of the bin Laden network have received hijack training, according to various sources, but no group directly tied to bin Laden’s al-Qaeda organization has ever carried out an aircraft hijacking. Bin Laden could be weighing other types of operations against US aircraft.” The PDB mentions other bin Laden related threats, including recent reports that the IG has obtained surface-to-air missiles and intends to move them from Yemen to Saudi Arabia to shoot down aircraft. [Washington Post, 7/18/2004; 9/11 Commission, 7/24/2004, pp. 128-130] The private intelligence group Stratfor will later say that, in addition to his ties with IG, Islambouli worked with bin Laden in the Maktab al-Khidamat charity front in Pakistan and is believed to have lived in Afghanistan in the 1990s as “part of the group of key Egyptian advisers surrounding bin Laden.” Islambouli will formally join with al-Qaeda in 2006. [Stratfor, 8/10/2006] In early 1998, the CIA ignored information from a recently retired CIA agent that claimed 9/11 mastermind Khalid Shaikh Mohammed was in a terrorist cell with Islambouli, both were experts on plane hijackings, and were planning to hijack planes (see Early 1998). Perhaps not coincidentally, on this same day, CIA Director George Tenet issues a “declaration of war” against al-Qaeda in a memo to the US intelligence community (see December 4, 1998). Also on this day, counterterrorism “tsar” Richard Clarke holds a meeting of his interagency Counterterrorism and Security Group (CSG) to discuss the threat. The group agrees that New York City airports should go on a maximum security alert that weekend and security should be boosted at other East Coast airports. The FBI, FAA, and New York City Police Department get versions of the PDB report. Later in December and again in January 1999 the source says the hijacking has been postponed because two operatives have been arrested in Washington or New York. But the FBI is unable to find any information to support the threat nor is it able to verify any arrests similar to what the source described, and the source remains mysterious. The high alert in New York airports is canceled by the end of January. [9/11 Commission, 7/24/2004, pp. 128-130] This PDB will be mentioned in President Bush’s famous August 6, 2001 PDB, but mentions that US officials “have not been able to corroborate” the plot (see August 6, 2001).
June 1999-March 2000: FBI Investigates Al-Qaeda-Linked Imam and Misses His Contacts with 9/11 Hijackers
The FBI conducts a counterterrorism inquiry into Anwar al-Awlaki, an imam who will later be suspected of involvement in the 9/11 plot. He serves as the “spiritual leader” to several of the hijackers (see March 2001 and After), and by 2008 US intelligence will determine he is linked to al-Qaeda (see February 27, 2008). 
The investigation is opened when it is learned he had probably been visited by a “procurement agent” for bin Laden, Ziyad Khaleel. Khaleel had helped buy a satellite phone for bin Laden; when he is arrested in December 1999 he reportedly tells the FBI crucial details about al-Qaeda operations in the US (see December 29, 1999). In early 2000 the FBI is aware when al-Awlaki is visited by an unnamed close associate of Sheikh Omar Abdul-Rahman. [US Congress, 7/24/2003, pp. 131 
; Washington Post, 2/27/2008] He also serves as vice president of the Charitable Society for Social Welfare (CSSW), the US branch of a Yemeni charity founded by Sheikh Abdul Majeed al-Zindani, a Yemeni imam who the US will officially designate a terrorist in 2004. CSSW also has ties to the Islamic Cultural Institute in Milan, Italy, considered one of the centers of al-Qaeda activity in Europe. The FBI begins investigating CSSW in 1999 after a Yemeni politician visits the US to solicit donations for the charity, and then visits Mahmoud Es Sayed, a known al-Qaeda figure at the Islamic Cultural Institute, on the same trip. [Burr and Collins, 2006, pp. 243; Washington Post, 2/27/2008] The FBI learns that al-Awlaki knows individuals from the suspect Holy Land Foundation and others involved in raising money for Hamas. Sources allege that al-Awlaki has even more extremist connections.
But none of these links are considered strong enough for criminal charges, and the investigation is closed. [9/11 Commission, 7/24/2004, pp. 517] Al-Awlaki is beginning to associate with hijackers Nawaf Alhazmi and Khalid Almihdhar shortly before the investigation ends. For instance, on February 4, one month before the FBI investigation is closed, al-Awlaki talks on the telephone four times with hijacker associate Omar al-Bayoumi. The 9/11 Commission will later speculate that these calls are related to Alhazmi and Almihdhar, since al-Bayoumi is helping them that day, and that Alhazmi or Almihdhar may even have been using al-Bayoumi’s phone at the time (see February 4, 2000). Al-Bayoumi had also been the subject of an FBI counterterrorism investigation in 1999 (see September 1998-July 1999).
August 4, 1999: FAA Considers Suicide Hijacking Possibility: Al-Qaeda Could Hijack Jet and ‘Slam It into a US Landmark’
The FAA’s Office of Civil Aviation Security Intelligence sends an internal memo summarizing the al-Qaeda hijacking threat. After reciting information available on the topic, a few principal scenarios are presented. One of them is a “suicide hijacking operation.” The 9/11 Commission will comment on this and another memo the previous year, “In 1998 and 1999, the FAA intelligence unit produced reports about the hijacking threat posed by bin Ladin and al-Qaeda, including the possibility that the terrorist group might try to hijack a commercial jet and slam it into a US landmark.” However, FAA analysts consider this an option of last resort, because “it does not offer an opportunity for dialogue to achieve the key goal of obtaining [Sheikh Omar Abdul-Rahman] and other key captive extremists.” [9/11 Commission, 7/24/2004, pp. 345, 561; 9/11 Commission, 8/26/2004, pp. 53]
January-February 2000: Secret Military Unit Identifies Al-Qaeda ‘Brooklyn’ Cell; Four 9/11 Hijackers Are Named, Including Mohamed Atta
A US Army intelligence program called Able Danger identifies five al-Qaeda terrorist cells; one of them has connections to Brooklyn, New York and will become informally known as the “Brooklyn” cell by the Able Danger team. This cell includes 9/11 hijacker leader Mohamed Atta, and three other 9/11 hijackers: Marwan Alshehhi, Khalid Almihdhar, and Nawaf Alhazmi. According to a former intelligence officer who claims he worked closely with Able Danger, the link to Brooklyn is not based upon any firm evidence, but computer analysis that established patterns in links between the four men. “[T]he software put them all together in Brooklyn.” [New York Times, 8/9/2005; Washington Times, 8/22/2005; Fox News, 8/23/2005; Government Security News, 9/2005] However, that does not necessarily imply them being physically present in Brooklyn. A lawyer later representing members of Able Danger states, “At no time did Able Danger identify Mohamed Atta as being physically present in the United States.” Furthermore, “No information obtained at the time would have led anyone to believe criminal activity had taken place or that any specific terrorist activities were being planned.” [CNN, 9/21/2005; US Congress, 9/21/2005] James D. Smith, a contractor working with the unit, discovers Mohamed Atta’s link to al-Qaeda. [WTOP Radio 103.5 (Washington), 9/1/2005] Smith has been using advanced computer software and analysing individuals who are going between mosques. He has made a link between Mohamed Atta and Sheikh Omar Abdul-Rahman, ringleader of the 1993 bombing of the World Trade Center. [Fox News, 8/28/2005; Government Security News, 9/2005] Atta is said to have some unspecified connection to the Al Farouq mosque in Brooklyn, a hotbed of anti-American sentiment once frequented by Abdul-Rahman, which also contained the notorious Al-Kifah Refugee Center. [Times Herald (Norristown), 9/22/2005] Smith obtained Atta’s name and photograph through a private researcher in California who was paid to gather the information from contacts in the Middle East. [New York Times, 8/22/2005] Lt. Col. Anthony Shaffer claims the photo is not the well-known menacing Florida driver’s license photo of Atta. “This is an older, more grainy photo we had of him. It was not the best picture in the world.” It is said to contain several names or aliases for Atta underneath it. [Jerry Doyle Show, 9/20/2005; Chicago Tribune, 9/28/2005] LIWA analysts supporting Able Danger make a chart, which Shaffer describes in a radio interview as, “A chart probably about a 2×3 which had essentially five clusters around the center point which was bin Laden and his leadership.” [Savage Nation, 9/16/2005] The 9/11 Commission later claims that Atta only enters the United States for the first time several months later, in June 2000 (see June 3, 2000). [9/11 Commission, 7/24/2004, pp. 224] However, investigations in the months after 9/11 find that Mohamed Atta and another of the hijackers rented rooms in Brooklyn around this time (see Spring 2000). Other newspaper accounts have the CIA monitoring Atta starting in January 2000, while he is living in Germany (see January-May 2000). Atta, Alshehhi, Almihdhar, Alhazmi and other hijackers have connections to associates of Sheikh Abdul-Rahman (see Early 2000-September 10, 2001).
Early 2000-September 10, 2001: 9/11 Hijackers Have Several Links to Sheikh Omar Abdul-Rahman
The 9/11 hijackers have links to several people associated with “Blind Sheikh” Omar Abdul-Rahman, the spiritual head of the group that bombed the World Trade Center in 1993. Abdul-Rahman has been in prison since the mid-1990s. 9/11 hijackers Khalid Almihdhar and Nawaf Alhazmi attend a mosque in San Diego that is visited by an unnamed associate of Abdul-Rahman who is under investigation by the Los Angeles FBI (see June 1999-March 2000); The mosque is also attended by Osama Basnan, who threw a party for Abdul-Rahman in 1992 (see Spring 2000); 9/11 hijacker Mohamed Atta is seen with Adnan Shukrijumah, son of Abdul-Rahman’s former translator (see May 2, 2001) and Atta and hijacker Marwan Alshehhi may attend a mosque run by his father (see 2000-2001); Hijacker Mohand Alshehri is seen near the Minnesota clinic where Abdul-Rahman is being held (see August 2001); Some hijackers have the same mailing address as Abdul-Rahman and at least one of his associates (see Before September 11, 2001); Khalid Almihdhar and other hijackers obtain false ID cards from Mohamed el-Atriss, an associate of an unindicted co-conspirator at Abdul-Rahman’s trial (see (July-August 2001)); [Lance, 2006, pp. 373] In addition, people attending a Bronx mosque are warned to stay away from lower Manhattan on 9/11 (see Early September 2001).
In early 2000, the Able Danger data-mining program apparently identifies Atta, Alshehhi, Alhazmi, and Almihdhar as members of al-Qaeda through their associations with people linked to Abdul-Rahman (see January-February 2000).
March 2000: Bin Laden Relative Associates with Islamic Militants in Philippines
Four Arabs allegedly visit the headquarters of the Abu Sayyaf Islamist militant group, deep in the jungles of the southern Philippines. One of them goes by the name Ibnu bin Laden and appears to be a close relative of Osama bin Laden. They give equipment and money. Just days later, Abu Sayyaf militants seize about 50 students and teachers and demand the release of Ramzi Yousef and Sheikh Omar Abdul-Rahman from US prisons in exchange for their hostages. (They are ultimately unsuccessful in winning their demands.) Osama bin Laden’s ties to Abu Sayyaf go back at least to 1988, when it is believed he personally visited the Philippines. [South China Morning Post, 10/11/2001 Sources: Wahab Akbar]
September 21, 2000: Al-Qaeda Leaders Vow to ‘Spill Blood’ to Free ‘Blind Sheikh’
Al Jazeera broadcasts a video featuring Osama bin Laden, Ayman al-Zawahiri, and
Ahmed Refai Taha, head of the Al-Gama’a al-Islamiyya militant group formerly led by the “Blind Sheikh,” Sheikh Omar Abdul-Rahman. In the video, filmed in Afghanistan several months earlier, bin Laden promises “to do all we can” to liberate Abdul-Rahman from his imprisonment in the US. Al-Zawahiri says that he is “talking business” about helping to free Abdul-Rahman. “I’m talking jihad.” Additionally, Mohammed Omar Abdul-Rahman, one of the Blind Sheikh’s sons, is heard on the tape saying, “O brothers, everywhere, avenge your leaders, avenge your sheik. Let’s go to the grounds of jihad. Let us spill blood. Let’s go spill blood.” [New York Times, 9/8/2004] In July 2001, the FBI will overhear an Arabic translator tell the Blind Sheikh that the October 2000 bombing of the USS ‘Cole’ was done for him “so he could be released.” The translator is also overheard saying that if he is not released, the bombers are prepared to “execute another operation.” [New York Times, 6/6/2002]
March-April 2001: Al-Qaeda Defector Describes Plot to Hijack US Airplane
In March 2001, the ISI learns that one of bin Laden’s operatives, who is working on a sensitive al-Qaeda job in Afghanistan, has been providing information to the CIA at the US consulate in Peshawar, Pakistan. The operative, whose CIA codename is “Max,” becomes worried that the ISI will disclose to al-Qaeda his dealings with the CIA. The next month, ABC News reporters Chris Isham and John Miller meet with Max and help him defect to the US and talk to the FBI. Max tells the reporters that in 1999 and 2000 he was trained as part of a small group by Saif al-Adel, one of al-Qaeda’s top leaders. Asked by Isham and Miller whether al-Qaeda is planning any operations targeting the US, he describes a plan to hijack an airplane carrying a US senator or ambassador and then use the dignitary to bargain for the release of the “Blind Sheikh,” Sheikh Omar Abdul-Rahman. US intelligence learned of the same basic plot idea in 1998 (see 1998). Max does defect and will be extensively debriefed by the FBI. [Miller, Stone, and Mitchell, 2002, pp. 282] In May 2001, a Senior Executive Intelligence Brief (SEIB) will be sent to top White House officials warning that “terrorist groups [are] cooperating on [a] US hostage plot”(see May 23, 2001). It is not known for how long Max was talking to the CIA or what he told them before he was exposed, but his account contradicts assertions that US intelligence did not have any well placed informants in al-Qaeda in Afghanistan. An Afghan named “Ahmed” defects around the same time and there are similarities between his case and that of Max, but it is unknown if they are in fact the same person or not (see April 2001).
April 2001: Courier Working for Bin Laden and CIA Flees Afghanistan, Warns Al-Qaeda Planning to Hijack Airplane in US
British cameraman Peter Jouvenal is reporting on Afghanistan at this time and using a young Afghan known only as “Ahmed” to run errands. Ahmed also has a job running errands for Osama bin Laden at the same time. Jouvenal will later recount that Ahmed was helping bin Laden by “meeting people in Pakistan and taking them across the border, taking messages around for Osama, buying his food, taking messages to the Internet and logging on and receiving, printing, sending.” Ahmed buys bin Laden’s meals most every day. But Jouvenal says that “somewhere on the line Ahmed tied up with the CIA” and decided that working for bin Laden was too dangerous. Ahmed asks Jouvenal for help to get a visa for himself and his family to defect to the US, which Ahmed eventually gets. He also tells Jouvenal that al-Qaeda is planning to hijack an airplane in the US in an attempt to get Sheikh Omar Abdul-Rahman released from prison. [Bergen, 2006, pp. 287-289] There are some similarities between Ahmed’s case and the case of “Max” who leaves Afghanistan around the same time and warns of a hijacking, but there are differences as well (see March-April 2001). It is not known if they are the same person. Regardless, Ahmed’s case contradicts CIA assertions that they never had any asserts close to bin Laden. It is not known why the CIA did not use Ahmed to track bin Laden’s location or poison his food. One month later the White House will be warned of the hijacking plot, but it is unknown if this came from Ahmed or other sources (see May 23, 2001).
May 23, 2001: White House Told Al-Qaeda May Stage Hijacking or Storm Embassy
A Senior Executive Intelligence Brief (SEIB) sent to top White House officials is entitled, “Terrorist Groups Said Cooperating on US Hostage Plot.” It warns of a possible hostage plot against the US abroad to force to release of prisoners being held in the US, including Sheikh Omar Abdul-Rahman (see July 1990). The report notes operatives might hijack an aircraft or storm a US embassy overseas. SEIBs are typically based on the previous day’s President Daily Briefing (see January 20-September 10, 2001), so it is probable President Bush is given this information. [9/11 Commission, 7/24/2004, pp. 255-256, 533; US District Court of Eastern Virginia, 5/4/2006, pp. 2 ] This report leads to an FAA warning to airlines noting the potential for “an airline hijacking to free terrorists incarcerated in the United States.” [9/11 Commission, 7/24/2004, pp. 255-256]
