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Report Says Fire, Not Explosion, Felled 7 W.T.C.

The long-delayed report by engineers here at the National Institute of Standards and Technology in suburban Washington is intended to solve one of still lingering central questions about the 2001 attacks: Why did 7 World Trade Center fall, if it was not hit by an airplane. "Heating of floor beams and girders caused a critical support column to fail," said Shyam Sunder, the lead investigator. "Video and photographic evidence combined with detailed computer simulations show that neither explosives nor fuel oils played a role in the collapse that brought the building down."

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