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Two US passenger airlines hijacked by al-Qaida terrorists smashed into the south and north towers of the iconic New York landmark on September 11, 2001, killing 2,996 people.

In the official version of events, the devastating impact caused the 110-storey skyscrapers – known as the Twin Towers – to collapse within two hours.

But for years conspiracy theorists have argued the buildings were toppled by bombs planted at their foundation – and it appears the President-elect agrees.

In an interview on the day of the abhorrent attacks, the billionaire real estate magnate was asked to give his expertise on the structure of the building.

Describing the north tower of the WTC as a “very, very strong building”, he suggests that twin bombs could have caused it to collapse.

(Image: GETTY)

Speaking about the tower's demise, he said: “It wasn’t architectural defect.

“How could a plane, even a 767 or 747 or whatever it might have been; how could it possibly go through that steel?

“I happen to think that they had not only a plane, but they had bombs – bombs that exploded simultaneously.

“Because I can’t imagine anything being able to go through that wall.”

The archive footage of the interview was uploaded to YouTube by pro-Trump group Trump Commission, which is probing the attack for answers.

The Trump Commission believes former US President George W. Bush covered-up the truth.

(Image: GETTY)

During the interview, Trump says he toured the foundations of the north tower after it was bombed in an earlier terror attack in 1993.

He said he couldn't believe the structure was able to withstand the explosion which was testament to its strength.

Various dubious reports that the 45th President of the United States may reopen the 9/11 investigation have been circulating online.

However, there is nothing to suggest the reality TV star will launch a new probe into the massacre now he has taken office.

(Image: GETTY)

Yet a top engineer looking into the attacks believes the final riddle of the 9/11 disaster has been blown wide open.

A study led by Dr. J. Leroy Hulsey of University of Alaska found that fires did not cause the collapse of the third World Trade Center tower.

An official investigation showed flaming debris from the neighbouring Twin Towers flew into the building, causing blazes to break out on multiple floors.

But Mr Hulsey claims fires inside the 47-storey skyscraper, known as Tower Seven, were not responsible for its destruction.