VIDEO: ‘Semi-transparent triangle’ seen over the city is ‘100% a real alien spaceship’.

An expert has reviewed video footage of an alleged UFO sighting and is certain that this is proof of alien life, ruling out the possibility that it could be a military craft.

An expert believes he has found irrefutable evidence of alien life (Image: Getty Images/Science Photo Library RF)

UFO watchers were left in shock when a “semi-transparent triangle” was spotted hovering over a city – and one expert said this is “100 per cent a real alien craft”.

A witness managed to capture a video of the bizarre sighting, and the short clip shows the unknown object floating effortlessly in the sky.

The witness estimated that the craft would be about 60-75 feet long, and experts believe that the object, which is triangular in shape, cannot be a jet plane of any kind as it does not move during the video.

The video was captured in Salt Lake City, Utah, United States, and comes just weeks after the US military announced it was investigating an ‘unidentified flying speaker’ who was spotted in a spy plane over an active conflict zone.

The witness, who remains anonymous, said: “I noticed a rather large triangular object hovering in the sky. At first it was floating stationary, but kind of somehow.

“Then it began to move slowly northward. I captured a total of four videos of approximately one minute and 30 seconds each. The object continued to float north and then appeared to disappear from view.

“The design was definitely a triangle and guess that size could be about 60-75 feet long. The location when first sighted was near the skyscrapers in downtown Salt Lake. It appeared to be about 1,250-1,500 feet in the sky.”

The sighting was shared by author Scott C. Waring, in his UFO Sightings Daily log.

Scott said: “That’s a really cool thing. A large empty triangle was seen over Salt Lake City. The object appeared to have a clear or reflective bulge at its bottom center that was semi-transparent, as shown in the image.

“This design has held the wrong position, which means it’s not one of the Stealth fighters often seen over Utah.

“However, it could be a USAF TR3B or a triangular craft using the design and body of the Stealth fighter. But the fact that it’s sunset and the USAF didn’t fly a TR3B during the day to keep it hidden from the public makes me know that this is 100% a real alien craft.

“This is a UFO.”

This sighting is just the latest in a series of unusual sightings as the US military is investigating an ‘unidentified flying plane’ after the massive metallic-looking structure was spotted by a spy plane over an active conflict zone.

The image, taken in April 2016, was part of a classified briefing for US officials and was shared by Jereмy CorƄell and George Knapp, on their podcast ‘Weaponized’.

Produced by the Pentagon’s Unidentified Aerial Phenomena Task Force, the briefing described the object moving from south to north, but noted that it did not change altitude.

What the situation is remains unclear, but according to Jeremy and George, the U.S. military is taking the matter seriously as they believe it was under “intelligent control.”