Look at Salem's words again. When he realized the FBI in New York was going to give him actual live explosives (instead of the inert material they said would be used to dupe the terrorist cell he had infiltrated), Salem began recording his interactions with the FBI. The government tried to hush up the case for 'national security reasons', but what came out of the trial is absolutely conclusive...the FBI used their agent to name the target, then they fueled the project with live explosives and allowed the bombing to go forward. And this was just the 'clean' information they HAD to allow out to the public.