The source also noted the Bureau spent 17 months investigation what they are convinced was an accidental explosion ; and that this tied up most of the JTTF staff at a time when 9-11 was being set up.
( Noting the fact this JTTF source was providing information after 9-11 , one must also consider the possibility the assertions were wholly self-serving. )
Like so many other things to come from the Clinton era FBI, that is a lie. Lots of parts got positive hits for explosives when tested in NY, and those parts were sent to the main FBI lab in Washington "for further testing." For some reason, without exception, all of those parts turned up negative in the later tests. (And now the FBI had physical possession of all of those parts, too.) Then the FBI turns around and states that there is zero evidence of any explosive! What happened to the seat backs with "red residue" on them? The FBI removed it. Furthermore, “A significant amount of debris was pressure-washed by NTSB personnel when it was brought ashore prior to chemical screening for explosive residue at the Calverton hanger by FBI agents.”. Source.