By Ralph Blumenthal
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 Salem, should be used, the informer said.
The account, which is given in the transcript of hundreds of hours of tape recordings that Mr. Salem secretly made of his talks with law-enforcement agents, portrays the authorities as being in a far better position than previously known to foil the February 26th bombing of New York City’s tallest towers.
The explosion left six people dead, more than a thousand people injured…
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