Another unidentified flying object has been seen hovering over a park in southwestern China's Chongqing Municipality after the investigation into a UFO that shut Hangzhou's Xiaoshan Airport on July 7 failed to reach a conclusion.

All the alleged witnesses said they saw the same thing - four lantern-like objects forming a diamond shape that hovered over the city's Shaping Park for over an hour, Xinhua news agency reported on July 15.

Pictures of the UFO were posted online. The four objects were moving as if they were one, and three had white lights but one was red, report said.

A witness surnamed Chen said it must have been a UFO and people began to notice it around 8pm yesterday.

"I stared at it and it did not move," Chen said. "After hovering for an hour, the thing started to fly higher and finally out of people's sight."

No official explanation has been given.

Meanwhile, the investigation into the UFO that shut down Hangzhou's Xiaoshan airport on July 7 has not yielded any result.

Six grassroots UFO experts came home empty-handed last night after they gathered in Hangzhou to investigate the sighting.

They wanted to obtain radar images from Hangzhou Airport, but officials refused, saying the radar caught nothing when the airport was shut down.