The strange craft was seen moving over thew sky of Mexico City, and several people captured the sight on video.

As the UFO moves through the air, a few hundred metres off the ground, it emanates a blurry field which is commonly reported from alien enthusiasts.

Many believe this latest sighting is strong evidence of the existence of extraterrestrials visiting Earth and, had the camera quality been better, it “would be definitive proof of the existence of aliens”.

The video was originally captured by a YouTube user known as Carlos Sanchez, but was quickly picked up by conspiracy theorists around the internet.

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Prominent UFO hunter Scott C Waring who believes it is a genuine sighting of an alien spaceship.

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Mr Waring writes for his blog UFO Sightings Daily: “This dark craft came right out into the open and was seen when a worker came outside for his break.

“The UFO tilted some as it moved, which is what many UFOs do in order to control their direction.

“Just sad he had such a bad camera. Looks like he is using an old phone to record it.

“Had it been an iPhone 7-8 this video would be definitive proof of the existence of aliens.

“I also notice that there is a blurry field around it, just as thousands of UFO reports also describe.”

Mexico is a hotspot for UFO sightings.

Earlier this year, a video showing a smoking crater next to a motorway lead to speculation it could be a UFO crash site.

The strange craft was seen moving over thew sky of Mexico City (Image: YOUTUBE)

The huge 26 feet across burning pit was filmed by sho‌cked onlookers as a thick mist rose into the air by the Torreón to Saltillo highway in the state of Coahuila in north east Mexico.

The pit was said to be as deep as it was wide and, according to reports, no evidence has been found as to what caused it.

Online theories have ranged from a crashed spaceship or a meteor falling to Earth.

One YouTube poster said: "Looks like a UFO landed and took off before anyone could see, leaving a crater.”