An email containing incredible UFO images allegedly from US military UFO sightings has been leaked online by an anonymous source.

The leaker claimed that they had accessed an alleged top secret UFO 'data retrieval program' known as 'Immaculate Constellation' — made famous this past November in a blockbuster public hearing before Congress

The black-and-white images show ornately spiked 'cruciform' UFOs, boomerang-shaped flying wings, a floating 'hot' cube, traditional flying saucers and several other craft that look straight out of classic science fiction. 

The screengrabs are said to be from infrared and thermal camera footage taken by military 'heads up displays,' but details were redacted to protect both sensitive US national security interests.

These unsettling depictions of highly varied craft were first made public by Nathan Latvaitis, who runs a YouTube channel called 'Strange Mysteries.'

'This person has asked me to redact their email address,' Latvaitis told his followers,  'although I can tell you that there is nothing identifiable in it.'

The sensational images have elicited heated debate among UFO believers and skeptics alike, however, with many on both sides questioning the leaker's story.

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