Melissa Block reports on what's known about the causes of the crash of TWA Flight 800. The National Transportation and Safety Board is currently in charge of the investigation. As long as the NTSB is running the investigation the assumption is this is an accident. But the FBI will take over the investigation if it is determined that the explosion of the plane was the result of foul play. Tons of wrechage have been brought ashore for use in determiing this but thus far, the plane's voice and data recorders have yet to be found. Rough weather is hampering efforts to recover more wreckage.
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