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A video of a mysterious black ring in the sky over Leamington Spa left people scratching their heads, and prompted a wave of speculation, writes Tom de Castella.
The ring was reportedly captured by a 16-year-old schoolgirl with her smartphone after she played tennis with her mother. The ring - which appeared to be close to Warwick Castle - remained in the sky for around three minutes before vanishing, it has been reported.
Several different theories were put forward as to what the ring could be. Some people speculated whether it would be possible to fake the video. In theory you can fake most things, says Iain McArthur, an expert at Audio Video Forensics. For instance, the footage wobbles. You can fake this handheld look. But other elements seem to ring true, he says. There's a "blob" on the top right and top left of the ring, suggesting movement - "something organic", he says. It's not clear how far away the ring is from the smartphone. The video footage is blurred at the sides. But he doesn't think it is suspicious. "Initially it doesn't look like it's faked." It's not like other video of unexplained sightings - in particular the hazy edges to the black circle. "The blurring element is different from any UFO footage I've seen," McArthur says.