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UFOs “have been here since 1947″, according to a British expert, who added that an alien crashed in the United States in the same year.
Philip Mantle, the editor of UFO Data Magazine, is unveiling his findings at an international conference this month.
He investigated the site in Roswell, New Mexico where many people believe there was an alien crash landing. He analysed rock, earth and vegetation.
The area is surrounded by charred trees and bushes and a mysterious blue substance that dribbles down rocks.