What happened
On the evening of July 7, 2010, the crew of an aircraft on approach noticed a bright, unidentified object over Hangzhou Xiaoshan International Airport in eastern China. Air traffic controllers decided to suspend operations. The airport was closed for about an hour, and more than a dozen aircraft were diverted to other airports or had their departures delayed. Chinese state media covered the incident extensively, and photos of luminous objects appeared online that, as it turned out, had nothing to do with the event. The case sparked a wave of interest in UFOs in China and a debate about how the authorities report aviation incidents.
Witnesses
The crew of the aircraft on approach and the air traffic controllers at Xiaoshan Airport.
Explanations and hypotheses
The Chinese authorities fairly quickly suggested that military activity was involved, and local media reported that the object may have been connected with flights from a nearby military airfield. Researchers from UFO organizations in Beijing and Shanghai found no radar records and also pointed to a military aircraft. The details of this explanation, however, were never officially disclosed.
Disputed A likely explanation exists, but some of the facts are still disputed.
More: Wikipedia (en)