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Images have emerged supposedly showing a black project government spy plane in the skies over Portland in Oregon, US.

The images – apparently in the skies near the Portland Air National Guard Base (PANG) – show a mysterious triangular object in startling clarity.

Two lights can be seen at the end of either wing.

YouTube conspiracy theorists Blake and Brett Cousins – of thirdphaseofmoon – were sent the photos and uploaded them in a clip on September 1.

They said they had received “multiple accounts from people who have seen this”.

(Image: YOUTUBE/THIRDPHASEOFMOON)

One witness told the channel the craft “didn’t make a sound” as it flew in the skies.

The craft – they claimed – was heading towards the Columbia river.

In the clip, Blake likened the sighting to the alleged TR-3B aircraft.

“People are saying they saw something strange in the skies,” he said.

“Is this the infamous TR-3B ready to make a grand entrance to the public?”

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(Image: YOUTUBE/THIRDPHASEOFMOON)

The TR-3 Black Manta is the name of a surveillance plane of the United States Air Force, speculated to have been developed under a black project.

It is said to be a supersonic stealth spy plane with a triangular design.

Believers in the programme say it was used during the Gulf War to provide laser designation for Lockheed F-117 Nighthawk bombers.

Blake continued to say the craft was “definitely military”, given the lights coming from it.

His brother added: “I’m going to rule out CGI, this is not a manipulation of photos.

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“What I like about it is there could be a consistency of what is going on.

“You could say it’s what a TR-3B looks like.”

More than 51,000 people have seen the footage since it was posted on September 1 with the caption: “FINALLY! It's About To Get Real...TR-3B Pang Base Portland.”

Hundreds of viewers have commented their thoughts on what the strange craft could be.

(Image: YOUTUBE/THIRDPHASEOFMOON)

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“Great picture of a TR-3B,” one wrote.

Another claimed that if the craft didn’t make a sound, it was a “key confirmation of anti-gravity propulsion” that the TR-3B supposedly uses.

But others suggested it was a different government project, with one suggesting it could be new stealth drone XQ-58A.

And some claimed the images were faked.