By redorbit.comMORE UFO sightings were reported across Wales after a mystery craft threatened a police helicopter over Cardiff this week.
The UFO zoomed straight at the chopper as the three-man cop crew prepared to land - and the pilot veered sharply to avoid being hit.
But experts revealed airline pilots have also spotted many UFOs over the nearby Bristol Channel this year.
And it seems the extraterrestrial beings may have made an appearance earlier in the week.
Clive Ward from Bridgend said he thinks he saw the same UFO days before it was spotted at St Athan.
He said: "At about 1am last Sunday morning I saw two aircraft flying over Bridgend, one at about 200ft and the other at about 1,000ft.
"The lower aircraft had a bright white light at the front and flickering red and green lights at the rear, the other showed just the flickering red and green lights.
"The lower aircraft was completely silent as it flew towards me, but emitted a faint drone as it turned and flew away.
"I watched these aircraft for about five minutes - I thought it was an unmanned surveillance aircraft operating out of RAF St Athan. But now wonder if our 'UFO' was one of these."
Expert David Coggins, who has studied UFOs for 30 years, said: "I'm told that in the past three months airline pilots have been reporting at least two or three encounters a week with UFOs over the Bristol Channel.
"Many of them will have rational explanations, but the probability is around 15 to 20% can't be identified."