From a CIA intelligence report on May 24, 2001: “According to information received from a call-in to the U.S. embassy [redacted] a group presently in the United States plans to conduct a terrorist operation involving the use of high explosives.”
– CIA, “A Group Presently in the United States Planning to Conduct a Terrorist Operation Involving the Use of High Explosives,” (CIA Intelligence Report), The Central Intelligence Agency’s 9/11 File:, The National Security Archive, May 24, 2001