An airport in Baotou, Inner Mongolia, was forced to shut to prevent passenger jets crashing into a UFO, according to reports.
Three flights to Baotou from Shanghai and Beijing were reportedly forced to circle the airport until the UFO disappeared.
Two other flights were diverted away from Baotou and to the nearby cities of Ordos and Taiyuan. The airport was shut for around an hour "to guarantee safety" according to a spokesman.
Witnesses reported a bright light shining in the sky on September 11 around two-and-a-half miles away from Baotou airport, before suddenly vanishing.
Xiaoshan International airport near the eastern city of Hangzhou was shut down on July 8 because of a UFO, although officials later confirmed the object sighted above the airport had been part of a military test at a nearby airbase.
In the far-western province of Xinjiang, another sighting on June 30 is thought to have been a missile test.
A number of sightings in Sichuan province may also be linked to the local custom of flying illuminated kites at night.
An unidentified flying object (UFO) forced Xiaoshan Airport in Hangzhou, China to cease operations on July 7. A flight crew preparing for descent first detected the object around 8:40 p.m. and notified the air traffic control department. Aviation authorities responded within minutes, grounding outbound flights and diverting inbound ones to airports in Ningbo and Wuxi.
Eighteen flights were affected. Though normal operations resumed an hour later, the incident captured the attention of the Chinese media and sparked a firestorm of speculation on the UFO's identity.
"It is a hidden U.S. bomber flying toward China," one Internet user wrote on Monday. Another wrote on Sunday night, "In my opinion, the UFO is neither a U.S. missile nor a Russian satellite. Suggestions that it is extraterrestrial are even more preposterous. Everyone, use your head. This is clearly a man-made phenomenon. Would the U.S. or Russia risk provoking China's anger by firing a missile or satellite rocket in Chinese skies, without warning? I believe the Chinese military is responsible for the UFO. It is a new missile or aircraft being tested out."
