The largest investigation of UFOs in the history of the world was launched by the former USSR in the late 1970s and produced piles of highly sensitive reports, including one that almost started World ...

Declassified Soviet-era files describe a terrifying night in 1982 when UFOs hovered over a missile base, activated nuclear launch systems and almost sent weapons toward New York.

Have aliens really descended upon British shores? In 2013, the UK declassified dozens of files outlining various UFO cases and how they were investigated.

Newly released Varginha fire department reports reveal erased, renumbered, and missing records on the day the alleged alien creature was captured.