A US Air Force captain has recalled a terrifying moment in which his nuclear base came “under attack from a UFO”.

He described how guards were left “frightened”, “screaming” and “babbling” by the bizarre sighting, which has been covered up for more than 50 years.

Robert Salas, a retired US Air Force Captain, was heading up a Malmstrom base in back in 1967.

He and his colleagues saw eight orange-coloured lights over the base, which was holding 10 nuclear missiles.

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