Also - I remember on 9/10/2001 that agents went in and shut down Arabic websites - wonder if I have a link on that - will check - but I remember reading about it day before and wondered what was up - so no one could warn anyone.
Foreign_Intelligence_Warnings
by Paul Thompson.
WARNINGS THAT THE DANGER WOULD COME FROM THE AIR
BRITAIN, WARNING #1: Al-Qaeda is planning to use aircraft in "unconventional ways", "possibly as flying bombs"
1999 (C): MI6, the British intelligence agency, gives a secret report to liaison staff at the US embassy in London. The reports states that al-Qaeda has plans to use "commercial aircraft" in "unconventional ways", "possibly as flying bombs."
BRITAIN, WARNING #3: An Al-Qaeda attack will involve multiple hijackings
Early August 2001 (C): Britain gives the US another warning about an al-Qaeda attack. The previous British warning (see July 16, 2001) was vague as to method, but this warning specifies multiple airplane hijackings. This warning is included in Bush's briefing on August 6.
CAYMAN ISLANDS, WARNING #2: Three al-Qaeda agents are part of a plot "organizing a major terrorist act against the US via an airline or airlines"
August 29, 2001: Three men from either Pakistan or Afghanistan living in the Cayman Islands are briefly arrested in June 2001 for discussing hijacking attacks in New York City (see June 4, 2001). On this day, a Cayman Islands radio station receives an unsigned letter claiming these same three men are agents of bin Laden. The anonymous author warns that they "are organizing a major terrorist act against the US via an airline or airlines." The letter is forwarded to a Cayman government official but no action is taken until after 9/11 and it isn't known when the US is informed. Many criminals and/or businesses use the Cayman Islands as a safe, no tax, no questions asked haven to keep their money. The author of the letter meets with the FBI shortly after 9/11, and claims his information was a "premonition of sorts." The three men are later arrested. Its unclear what has happened to them since their arrest. FTW
EGYPT, WARNING #1: An undercover agent learns 20 al-Qaeda agents are in the US, four have received flight training
http://www.cooperativeresearch.org/timeline/main/foreignwarnings.html