Ramzi Yousef, who entered the United States on an Iraqi passport, was the ringleader of the 1993 World Trade Center bomb plot. According to informant Emad A. Salem, the FBI had advance knowledge of the bombing and were supposed to provide the terrorist group led by Yousef with dummy explosives.
However, the FBI gave the group real explosive and allowed the attack to go ahead, killing six people and injuring more than a thousand.
Terry Nichols, who helped McVeigh plan the attack on the Oklahoma City Federal Building, later admitted that McVeigh had multiple accomplices and that he was being steered by a high-level FBI officials. Dozens of eyewitnesses asserted that Timothy McVeigh had an accomplice!!