9/11 Truth, Here is the Proof, WTC Building 7 imploded due to Fire and Heat
Fires in the 47-story office tower at the edge of the World Trade Center site undermined floor beams and critical structural columns, federal investigators concluded Thursday, as they attempted to curb still-rampant speculation that explosives or fuel fires were responsible for the building’s collapse of Sept. 11, 2001.
Text of the Report (pdf)
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.”
No one died when 7 World Trade Center fell, nearly seven hours after the twin towers came down. But the collapse of the adjacent tower — once home to branch offices of the Central Intelligence Agency, the Secret Service and to the Giuliani administration’s emergency operations center — is cited in hundreds of books and Internet sites as perhaps the most compelling evidence that an insider secretly planted explosives, intentionally destroying the tower.
It is the first skyscraper in modern times to collapse primarily as a result of a fire.
The investigators determined that debris from the falling twin towers ignited fires on at least 10 floors at 7 World Trade Center, which was about 400 feet north of where the city’s two tallest buildings once stood. The blazes burned out of control for six hours, as the city fire department, devastated by the collapse of the twin towers, abandoned its efforts to extinguish the fire, and the sprinkler system was incapacitated.
The heat from these fires, the investigators said, caused the beams on the lower floors of the east side of the tower to expand, ultimately causing a girder on the 13th floor to disconnect from a critical interior column that supported the building’s long floor spans. Once the 13th floor gave way, a cascade of floor failures started down to the fifth floor, leading to the overall collapse of the tower.
The investigators said that if the city water main had not been broken during the collapse of the twin towers, the sprinkler system would likely have put out the fires at 7 World Trade Center, and the building would not have fallen.