Another unidentified flying object (UFO) has been spotted hovering over a part in southwestern China's Chongqing province after a similar sighting last week caused massive flight delays at a municipal airport, according to latest Chinese media reports.

All alleged witnesses of the latest sighting spoke of "four lantern-like objects", according to Chinese state-controlled news agency Xinhua.

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The witnesses claimed that the objects "formed a diamond shape and hovered over the city's Shaping Park for over an hour," Xinhua said.

One witness, Mr Chen, said, "I stared at it and it did not move. After hovering for an hour, the thing started to fly higher and finally out of people's sight." He also added that it must have been a UFO and people began to notice it around 8pm Wednesday.

Last week, Hangzhou's Xiaoshan Airport shut down operations for an hour after a UFO appeared, affecting up to 18 flights and affecting 2,000 passengers, various Chinese media reports said.

No official explanation has been given for the strange sightings and investigations into the first UFO sighting failed to reach a conclusion.