The building, which was situated next to New York’s Twin Towers, crumbled after the planes hit the towers.
Conspiracy theorists have long suggested "controlled explosions" were carried out in the building – but the official version of events says flaming debris from the burning Twin Towers flew into the 47-floor skyscraper.
Tower 7, which housed the Secret Service, the CIA, the Department of Defence and the Office of Emergency Management, collapsed after seven hours of burning.
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