South Wales police are still scratching their heads over the UFO that appeared on one of their cameras last Saturday, reports the Daily Mail in Britain.

Officers flying in a helicopter across the Bristol Channel around 9:30 p.m. local time became aware of the mystery object when it showed up on the aircraft's thermal camera. It was not visible to the eye, nor did air-traffic control detect the unidentified object.

The helicopter's altitude at the time was 1,000 feet.

"It's difficult to judge the size but we filmed it for just over seven minutes," the police tweeted, while requesting suggestions from the public as to the object's identity.

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View the police video of the UFO tracked by thermal camera:

Some have suggested the UFO is a Chinese lantern or balloon, but those ideas have been rejected since the object was flying against the wind.

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The sighting by police follows another just a few miles away relayed in February by a local woman, reports SomersetLive. Fiona Powell took a photograph along the beach while walking with family and friends that, on closer inspection, showed what appeared to be a flying saucer in one corner.

WND reported in July that UFO enthusiasts accused NASA of shutting down the live stream of the International Space Station when an unidentified object moved across the screen and stopped.

"This could well be a meteor or the like," UFO hunter Streetcap1, in a video posted shortly after viewing the shutdown of the ISS feed. "[But] what made it interesting was that the camera cut off when the UFO seemed to stop."

NASA, for its part, denied cutting any feeds – but this is not the first time such allegations have plagued the agency.

In April, NASA was put on the defensive over allegations its technicians continuously and purposely shut down feeds when unidentified objects fly into the path of video vision. An agency spokesperson said then that NASA never intentionally cuts video, but that the stream can sometimes be lost due to technical difficulties of signalling from the ISS.

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