January 30, 2001: Hijacker Ziad Jarrah is questioned for several hours at the Dubai International Airport, United Arab Emirates, at the request of the CIA for "suspected involvement in terrorist activities," then let go. This is according to United Arab Emirates, US and European officials, but the CIA denies the story. The CIA notified local officials that he would be arriving from Pakistan on his way back to Europe, and they wanted to know where he had been in Afghanistan and how long he had been there. US officials were informed of the results of the interrogation before Jarrah left the airport. Jarrah had already been in the US for six months learning to fly. "UAE and European intelligence sources told CNN that the questioning of Jarrah fits a pattern of a CIA operation begun in 1999 to track suspected al-Qaeda operatives who were traveling through the United Arab Emirates." He was then permitted to leave, eventually going to the US. [CNN, 8/1/02] Why the US would flag him now but not when he entered the US or after is unclear (see September 9, 2001).