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He said: "I work with aircraft and grew up next to Manchester Airport so I know exactly what a plane looks and sounds like. This was definitely not a plane.
"It was a circular disc which was glowing bright, hovering hundreds of metres up.
"Other people must have spotted it. It was unlike anything I've ever seen in my life. It really did look like the alien aircraft in films. It had an antenna fixed to the back."
Mr Madden's claim follows a string of recent UFO "sightings".