World Trade Center Building 7 was reported as collapsed on September 11th 2001 as a result of fires. The engineering department of the University of Alaska Fairbanks undertook a 4 year long study into the collapse of WTC7, and their findings, published in Sept. 2019 and open to peer review categorically state: "...fire did not cause the collapse of WTC 7 on 9/11, contrary to the conclusions of NIST [Nat'l Inst. of Standards and Technology] and private engineering firms that studied the collapse." Explosives would have had to have been placed prior to the event to do effectuate the collapse shown. Also see: No Plane Hit Pentagon