http://www.nytimes.com/2003/09/04/politics/04SAUD.html?ex=1063252800&en=808be44ae0b6c3aa&ei=5062&partner=GOOGLECheck this paragraph out from the article:
"Mr. Schumer said in an interview that he suspected that some of the Saudis who were allowed to leave, particularly two relatives of Mr. bin Laden who he said had links to terrorist groups themselves, could have shed light on the events of Sept. 11."
And then check out this entry from my 9/11 Timeline for more on these two:
September 11, 1996: An FBI investigation into two relatives of bin Laden, begun in February 1996, is closed. The FBI wanted to learn more about Abdullah bin Laden, "because of his relationship with the World Assembly of Muslim Youth (WAMY) - a suspected terrorist organization." (Guardian, 11/7/01) Abdullah was the US director of WAMY and lived with his brother Omar in Falls Church, Virginia, a town just outside Washington. The coding on the document, marked secret, indicates the case involved espionage, murder, and national security. WAMY has its offices at 5613 Leesburg Pike. Remarkably, it is later determined that four of the 9/11 hijackers lived at 5913 Leesburg Pike at the same time the two bin Laden brothers were there. WAMY has not been put on a list of terrorist organizations in the US, but it has been banned in Pakistan. (BBC Newsnight, 11/6/01, Guardian, 11/7/01) The Bosnian government later says a charity with Abdullah bin Laden on its board had channeled money to Chechen guerrillas, something that "is only possible because the Clinton CIA gave the wink and nod to WAMY and other groups who were aiding Bosnian guerrillas when they were fighting Serbia, a US-approved enemy." The investigation into WAMY is only restarted two days after 9/11, and after the bin Laden brothers have left the US. (Best Democracy Money Can Buy, by Greg Palast, 2/03)
So even while the FBI was arresting Muslims, including literally by looking up random names in the phone book, they were letting go two bin Laden relatives that they knew from a previous investigation had direct ties to al-Qaeda. They restart an investigation into these two the same day they let them leave the country!
But these two were not the only bin Laden relatives with such ties. Here are a few more timeline entries:
February 2001 (B): A former CIA anti-terror expert later claims that an allied intelligence agency sees "two of Osama's sisters apparently taking cash to an airport in Abu Dhabi (United Arab Emirates), where they are suspected of handing it to a member of bin Laden's al-Qaeda organization." This is cited as one of many incidents showing an "interconnectedness" between Osama bin Laden and the rest of his family. (New Yorker, 11/5/01)
February 26, 2001: Bin Laden attends the wedding of his son Mohammad in Kandahar, Afghanistan. Although bin Laden is supposedly long estranged from his family, bin Laden's stepmother, two brothers and sister are also said to have attended, according to the only journalist who was invited. (Reuters, 3/1/01, Sunday Herald, 10/7/01)
July 4-14, 2001: Bin Laden, America's most wanted criminal with a $5 million bounty on his head, supposedly receives lifesaving treatment for renal failure from American surgeon specialist Dr. Callaway at the American hospital in Dubai, United Arab Emirates. He is possibly accompanied by al-Qaeda #2 Dr. Ayman al-Zawahiri plus several bodyguards. Callaway later refuses to answer any questions on this matter. (Le Figaro, 10/31/01, Agence France-Presse, 11/1/01, London Times, 11/01/01) During his stay, bin Laden is visited by "several members of his family and Saudi personalities," including Prince Turki al Faisal, then head of Saudi intelligence, as well as two CIA officers. (Guardian, 11/1/01)