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.
Building 7 has been at the centre of conspiracy theories since the Twin Towers were brought down
The Twin Towers were hit on September 11, 2001, killing almost three thousand people
Building 7 is at the centre of a new report which claims the debris could not have brought it down
The National Institute of Standards and Technology insists it was the first and only steel skyscraper in the world to collapse as a result of fire.
But new bombshell claims suggest “office fires” could not have caused its destruction.
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It is our preliminary conclusions based upon our work to date that fire did not produce the failure at this particular building
Dr J Leroy Hulsey
The report, by a group of top engineers from the University of Alaska, insists the flames could not have brought the tower down.
Dr J Leroy Hulsey revealed the team's boss findings at the Justice In Focus Symposium in New York.
He said: “It is our preliminary conclusions based upon our work to date that fire did not produce the failure at this particular building.”
The findings will add fuel to conspiracy theories which suggest the twin towers and WTC 7 were blown up.
Some have even blamed the US Government which they say wanted to provide the grounds for military strikes in the Middle East.
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The World Trade Centre was brought down in 2001GETTY
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Study finds fire did not cause Twin Towers collapse
Historically, skyscrapers have resisted collapse after fires.
A skyscraper in Philadelphia burned for 18 hours in 1991 and a high-rise in Madrid in 2005 each remained standing following fires.
There is no evidence of death in Tower 7 - located around 100 metres from the Twin Towers.
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