Of course, this was back in June 2001.
Tapes Depict Proposal to Thwart Bomb Used in Trade Center BlastExcerpt:
"Law-enforcement officials were told that terrorists were building a bomb that was eventually used to blow up the World Trade Center, and they planned to thwart the plotters by secretly substituting harmless powder for the explosives, an informer said after the blast.
The informer was to have helped the plotters build the bomb and supply the fake powder, but the plan was called off by an F.B.I. supervisor who had other ideas about how the informer, Emad A. Salem, should be used, the informer said."
Freeper quote: "more terrorism = more power for the FBI = diminishing Constitutional Rights!!!"
On edit: ""You think the FBI handled OKC the same way? "Evidence of prior knowledge:"
More:
http://www.freerepublic.com/forum/a3b3c830e34de.htm (if you dare)