There are some VERY credible sources ie: ex-military that are witnesses. Dozens describe seeing basically the same "shooting star" type of projectile in the sky just seconds before the plane exploded.
There was an active attempt by Clinton lackeys to discredit these witnesses. This book has made me a believer. Didn't think there was any way I could possibly hate BC more than I already did, but I do.
Read the book, they present TONS of evidence to back up their claims.
MKM
A high school friend of mine flew co-pilot on TWA 747's. He saw the reconstructed wreckage, and inside the company it was widely accepted that the plane was hit by a missile, plain and simple -- the center fuel tank explanation was pure BS.