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If you believe these things are extra terrestrial craft then you cannot rule out that what is happening is some kind of covert reconnaissance."
He said he was initially sceptical about UFOs, but access to classified files on the subject and investigation of a series of spectacular UFO sightings gradually changed his mind.
Among these he cited reports of a "vast, triangular-shaped craft" firing a narrow beam of light onto the ground and emitting a low-frequency humming sound that was spotted flying over RAF Cosford in the West Midlands and RAF Shawbury in Shropshire in 1993.
"Most of the witnesses were police and military personnel," he said.
"Hundreds of members of the public also had sightings over a period of several hours."
"A meteorological officer described how it moved at a very slow speed, around 30-40 miles per hour, then very suddenly accelerated beyond the horizon in seconds."