An infamous "lost" UFO photo should be released by the US when intelligence agencies officials publish a much-anticipated report on the strange encounters, an investigator has said.

Nick Pope, one of the world’s leading experts on UFOs, who probed the phenomena for the Ministry of Defence (MoD), has urged the Pentagon to published the so-called "Calvine Photo".

Mr Pope told The Sun Online the photo is one of the "most compelling" pieces of UFO evidence he has ever seen - and he saw the image firsthand while working for the MoD.

The photo - which was taken in 1990 and allegedly shows a 100ft object hovering over Calvine in the Scottish Highlands - once hung on the wall of the UFO investigations unit in Whitehall.

However, this photo was removed without a trace after a diplomatic row sprung up when UFO investigators at the MoD questioned the Americans about whether they were testing any secret prototype aircraft in the area.

And since then the stunning image, which is said to be unlike any other UFO photo - being crystal clear, taken in broad daylight and meticulously authenticated by defence officials - has remained under wraps.

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