Two agencies investigated the collapse. One was fema, which relied on volunteers, and the other was nist, the National Institute for Standards and Technology funded by Congress. 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. (07:03–07:13)
CLAIM
Asserts that FEMA explained the collapse of Building 7 was due to debris from the North Tower.
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