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.

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.

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.

Historically, skyscrapers have resisted collapse after fires.

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