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Allegations of FBI foreknowledge
In the course of the trial it was revealed that the FBI had an informant, a former Egyptian army officer named Emad A. Salem. Salem claims to have informed the FBI of the plot to bomb the towers as early as February 6, 1992. Salem's role as informant allowed the FBI to quickly pinpoint the conspirators out of the hundreds of possible suspects.
Salem, initially believing that this was to be a sting operation, claimed that the FBI's original plan was for Salem to supply the conspirators with a harmless powder instead of actual explosive to build their bomb, but that the FBI chose to use him for other purposes instead.  He secretly recorded hundreds of hours of telephone conversations with his FBI handlers; reported by Ralph Blumenthal in the New York Times, Oct. 28, 1993, secton A,Page 1.