and while not the sole cause, it was a contributing factor that the points that were damaged by the plane crash weakend the structural supports and put extra loads onto the existing supportsMine is the same as the conclusion of the American Society of Civil Engineers, of which I have been a member for almost 30 years. The unabated fires brought the buildings down: The floor trusses softened and drooped, the columns then lost lateral support and buckled at their weakest points, which were bolted connections in 20' lengths. When one 40' section gave way the building above that level dropped, "free fall", to the sections below, which were not designed to handle those dynamic loads. Therefore the failure progressed to the entire building.
it was a combination effect
thats why these troofer morons have to ignore the science