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Top engineers from the University of Alaska believe fires inside the 47-storey skyscraper, known as Tower Seven, were not responsible for its destruction.

In the official version of events, flaming debris from the neighbouring Twin Towers flew into the building, causing blazes to break out on multiple floors.

Seven hours after the plane attack on the Twin Towers, Tower Seven collapsed completely.

A report from the National Institute of Standards and Technology found that ordinary fires caused the collapse.

This made it the the first and only steel skyscraper in the world to collapse because of fire, the BBC reported.

(Image: GETTY) (Image: GETTY)

For years conspiracy theorists have argued the building was brought down by a “controlled demolition” at ground level.

But now the bombshell study from Dr. J. Leroy Hulsey and his team has revealed ordinary “office fires” could not have caused the building to collapse.

In a presentation of his findings at the Justice In Focus Symposium in New York in September, Hulsey dismissed the fire narrative as false.

He said: “It is our preliminary conclusions, based upon our work to date, that fire did not produce the failure at this particular building.”