There is information about this in the FBI Al-Awlaki case file. Basically this Saudi guy that worked for Saudi intelligence paid for the housing of two of the h

There is information about this in the FBI Al-Awlaki case file. Basically this Saudi guy that worked for Saudi intelligence paid for the housing of two of the hijackers and lived across the street. There was also some inquiry because, IIRC, he gave them a computer that had a flight simulator installed. This entire time the US Government knew it and covered it up and instead blamed Iran, Iraq, et cetera