Jan Harzan, one of the world’s top UFO investigators, said his organisation had proved over the past 50 years that flying saucers really exist.
Mr Harzan is executive director of the Mutual UFO Network (MUFON), the world’s biggest organisation dedicated to UFO and alien research.
The US-based organisation maintains a database of sightings that is updated daily, with many cases investigated.
It has so far analysed more than 100,000 UFO cases.
Many are explained away, but the organisation says around five percent have no earthly explanation.
Mr Harzan was speaking in response to recent revelations that the US Government ploughed millions of dollars into a top-secret investigation into the potential threat posed by UFOs.
He said: “MUFON has been investigating and researching the UFO phenomenon since 1969.
“The group's analysis of over 100,000 UFO reports over the past five decades has shown three things to be true:
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