FEMA's explanation is that falling debris from the North Tower damaged the outer facade of Building 7 and started a series of fires in the lower floors. According to nist, the collapse of the towers in the morning had damaged water mains, so the building's sprinkler systems failed. Since the building had been evacuated earlier in the morning and the fire department's resources were stretched to a breaking point by ongoing search and rescue missions, fire chiefs made the decision early on not to fight the fires that were burning in Building 7. (07:12–07:19)
CLAIM
Asserts that NIST reported the collapse of the towers damaged water mains, causing sprinkler failure in Building 7.
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