Law-enforcement officials were told that terrorists were buildinga bomb that was eventually used to blow up the World Trade Center,and they planned to thwart the plotters by secretly substitutingharmless powder for the explosives, an informer said afterthe blast.
The informer was to have helped the plotters build the bomband supply the fake powder, but the plan was called off byan F.B.I. supervisor who had other ideas about how the informer,Emad Salem, should be used, the informer said.
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