New York, Sep 6 : Investigators have finally determined that fire caused Building 7 at the World Trade Center to collapse on September 11, 2001.
The fall of the 47-story World Trade Center''s Building 7 at 5:20 p. m. on Sept. 11, 2001, was primarily due to fires from the building itself, NIST announced Friday, following an extensive, three-year investigation. This was the first known instance of fire causing the total collapse of a tall building, the agency said.
Dr. Shyam Sunder with the National Institutes of Standards and Technology said it was primarily due to fire.
After a three year investigation, he discovered debris from Tower 1 started fires on at least 10 floors of Building 7.