The fires caused by the collapse of the North Tower, burned for hours, compromising WTC 7’s structural integrity, and 7 WTC collapsed at 5:21 p.m – Wikipedia
September 11, 2001 5:21 P.M.
The fires caused by the collapse of the North Tower, burned for hours, compromising WTC 7’s structural integrity, and 7 WTC collapsed at 5:21 p.m – Wikipedia