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The photographs and sighting are being investigated by the Mutual UFO Network (MUFON) after it received a report from an eyewitness. The witness, who has not been named, said: "I looked up to see what I first thought was a passenger plane on fire. "Within a second or two, I was startled because I had realised this was no plane. "It was a dull silver-domed object with orange lights around its middle. "It was a typical domed UFO looking craft. "It was obvious to me that this craft was in trouble." The witness said there was no flame or intense burning, but some sort of vapour trail being left. They added: "The vapour trail didn't seem to be coming from any particular vent or place on the craft, it seemed to almost enshroud the craft and then slip off and fall behind. It would leave a trail and dissipate within a few seconds. "The colour was both concerning and fascinatingly beautiful. "My first thoughts were that it was highly poisonous or radioactive. "The rumbling hiss seemed to increase in intensity coinciding with the billowing emerald green shimmery misty vapour or smoke this craft was leaving in its wake." The sighting happened around 11am on July 20 2013 in Huntington Beach, California, USA, but has only just been reported to US-based MUFON, which keeps a global database of UFO sightings.