“On Friday [June 22, 2001], the CIA sent out a cable to all its stations. ‘Threat UBL [Usama Bin Laden] Attack Against US Interest Next 24-48 Hours.’ it said. The same day the FBI issued its own warning to its field offices in its daily ‘UBL/Radical Fundamentalist Threat Update.’ More CIA warnings continued on Saturday [June 23, 2001]. ‘Bin Laden Attacks May Be Imminent,’ said one. ‘Possible Threat of Imminent Attack from Sunni Extremists,’ said another.”
– James Bamford, The Shadow Factory, Page 56