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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.

GETTY Building 7 has been at the centre of conspiracy theories since the Twin Towers were brought down

GETTY The Twin Towers were hit on September 11, 2001, killing almost three thousand people

GETTY 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.

September 11 Survivors: where are they now? Fri, September 11, 2015 Pictures showing then and now of the survivors and emergency services teams from the World Trade Center attacks on September 11th 2001 in New York Play slideshow AFP/Getty Images 1 of 11 Marcy Borders, known as the Dust Lady, was captured leaving the North Tower after it was hit by a hijacked plane

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.

GETTY The World Trade Centre attacks rocked the globe but also sparked conspiracy theories