Conspiracy theorists believe this video is proof the Twin Towers were brought down by a controlled explosion on 9/11

WACKY online conspiracy theorists claim to have new proof that the Twin Towers were brought down by an explosion rather than a terrorist attack.

The September 11 2001 attacks saw the North and South towers of the World Trade Center in New York collapse to the ground after planes were crashed into them. Video and photographs of them crumbling to the ground are some of the most iconic ever.

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Another plane was crashed into the Pentagon and one more plummeted into a field, with 2,996 people losing their lives and 6,000 injured.

Since the events there have been multiple, unproven, claims linking the attacks not to terrorists but the US government.

The new theory rests on a YouTube video that compares the difference between buildings that collapse under a controlled explosion and those that don't.

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This small group of conspiracy theorists disagree with the 2002 investigation following the destruction of the Twin Towers, which concluded that the collapse of the buildings was mainly due to fire.

The narrative in the video claims that "jet fuel doesn't melt steel beams".

According to these far-fetched claims, the only explanation for the vertical collapse of the Twin Towers can be that they were destroyed by a controlled explosion.

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Steven Jones, Robert Korol, Anthony Szamboti and Ted Walter, who are all engineers, are the brains behind this wacky theory.

The main points they base their evidence of controlled explosion on are:

1. Fires rarely reach a hot enough temperature to make steel structures buckle
2. Most skyscrapers have sprinklers installed that prevent a fire reaching a certain temperature
3. Flame-proof materials are normally used in high-rise buildings to stop them collapsing

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The theorists go on to argue that John Skilling, one of the top structural engineers of the World Trade Centre, said in 1993 that the buildings were created to be strong enough to withstand the force of a plane hitting them.

The engineer is quoted as telling the Seattle Times that in the instance of a plane crash "there would be a horrendous fire. A lot of people would be killed, but the building structure would still be there".

Could this latest theory be enough revive research into the events of 9/11?