FBI releases real-life 'X files'

Details of UFO sightings in America have been made public and include reports of aerial explosions and objects falling from the sky.

The FBI files, which are now available for all to read for the first time, include a memo entitled 'Flying Discs' which describes how a policeman, a highway patrolman and an army guard witnessed a strange object in the sky on the night of April 4, 1949.