The Mutual UFO Network (MUFON) today received a report from an eyewitness who shaped the "flying saucer" near the great wall at Simatai in the north of Miyun County, 72 miles northeast of Beijing.
US-based MUFON is the world's largest independent organisation dedicated to UFO, alien and other paranormal research.
It also maintains a database of sightings from across the globe, which it investigates.
The unnamed photographer said in a report to MUFON: "I Went for great wall hiking.
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