Further, the National Institute of Standards and Technology’s investigation concluded that building 7’s collapse wasn’t caused by a controlled demolition. Debris from the collapsed North Tower started a fire in the building, which led to its collapse.
I remember getting a call from the fire department commander, telling me that they were not sure they were gonna be able to contain the fire, and I said, “We’ve had such terrible loss of life, maybe the smartest thing to do is pull it.” And they made that decision to pull and we watched the building collapse.
The Commander told Mr Silverstein that there were several fire fighters in the building working to contain the fires. Later in the day, the Fire Commander ordered his fire fighters out of the building and at 5:20pm the building collapsed. No lives were lost at 7 World Trade Centre on September 11, 2001.
The National Institute of Standards and Technology’s investigation concluded that building 7’s collapsecaused by a controlled demolition. Debris from the collapsed North Tower started a fire in the building. The fire sprinkler system in the lower floors had failed, allowing the fire to burn out of control, which eventually caused steel support elements to thermally expand. This led to a chain of structural failures that caused the building’s collapse.BBC. “Q&A: The collapse of Tower 7.
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