query: Who carried out the World Trade Center hijacking?
passage: Hijackers in the September 11 attacks
The hijackers in the September 11 attacks were 19 men affiliated with al-Qaeda. 15 of the 19 were citizens of Saudi Arabia, and the others were from the United Arab Emirates (2), Egypt, and Lebanon.[1] The hijackers were organized into four teams, each led by a pilot-trained hijacker with three or four "muscle hijackers," who were trained to help subdue the pilots, passengers, and crew.
passage: Responsibility for the September 11 attacks
Imam Anwar al-Awlaki has been linked to Al-Qaeda and persons involved in the attacks, though he denied any connections. In 1998 and 1999, he served as Vice President for the Charitable Society for Social Welfare (CSSW) in San Diego, founded by Abdul Majeed al-Zindani of Yemen, who has since been placed on many terrorism lists.[78] During a terrorism trial, Federal Bureau of Investigation (FBI) agent Brian Murphy testified that CSSW was a "front organization to funnel money to terrorists," and US federal prosecutors have described it as being used to support Osama bin Laden and al-Qaeda.[78][79] The FBI investigated al-Awlaki beginning in June 1999 through March 2000 for possible fundraising for Hamas, links to al-Qaeda, and a visit in early 2000 by a close associate of "the blind sheik" Omar Abdel Rahman (now in prison for his role in the 1993 World Trade Center attack). The FBI's interest was also triggered by the fact that he had been contacted by a possible "procurement agent" for bin Laden, Ziyad Khaleel, who helped purchase a satellite phone to call his Yemen communications hub that was used in planning the attacks.[78][80] But the FBI was unable to unearth sufficient evidence for a criminal prosecution.[78][81][82][83][84][85]