NPR's Melissa Block reports from the salvage scene on Long Island. Investigators have been talking to a number of people who were in the area when the Boeing 747 went down last week--some say they saw something suspicious just before the crash, but no one has been able to confirm their claims. Meanwhile, investigators say early indications that there is residue of explosives on some of the wreckage were WRONG, and that they have not found any residue.
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