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A conspiracy theorist claims to have captured a huge UFO hurtling at 1,000mph over Las Vegas – and says several other witnesses saw it.

YouTube user UFOs over Vegas posted the bizarre footage on December 19, where it has since become a viral sensation with 135,000 views.

The clip begins with a huge bright object slowly moving up from the mountains surrounding the Nevada city.

“This thing looks big and a long way away,” he says.

The object then lifts up into the sky and – when it appears to reach its altitude – it starts speeding up.

“Once it starts moving, it is going to haul a***,” he continues. “This thing is moving, no sound.”

(Image: YOUTUBE/UFOS OVER VEGAS)

The mysterious object repeatedly flashes blue as it hurtles over the bustling region.

According to the YouTube user, four witnesses saw the same object and described it in exactly the same detail.

“Nobody heard any sound at all and the UFO could have covered a 50 mile span in three minutes,” he added.

“That would equal 1,000mph. To be fair let's just say it only travelled 25 miles.

“Even then it would have to be travelling at 500 miles an hour.

“No helicopter can do that, you must be a passenger on a commercial airline at altitude to do that.”

But he strongly dismissed these claims, suggesting instead that it was a UFO.

Since he posted the clip to YouTube, hundreds have voiced their thoughts with many suggesting that the proximity of the sighting to the Nellis Air Force Base suggested it could be military.

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“Secret Space Force having some fun with you guys,” one wrote.

Another commented: "For them to hang around the Nevada Desert and close to a lot military bases, got to be military or Space Force?”

Others believed there was an extraterrestrial reason behind it.

But there are some that dismissed the sighting as nothing but a commercial airliner though.