BEIJING, July 25 (Reuters) - A mosque under construction in northwest China has collapsed, killing at least seven people with others possibly buried under the rubble, Xinhua news agency said on Friday.

The accident happened on Thursday in a town in Qinghai province which is home to more than 18,000 Muslim ethnic Hui people, Xinhua said.

"About 20 people received injuries of different degrees and the casualties may increase as more people could be buried in the debris," Xinhua quoted rescuers as saying.

An investigation into the accident, which happened just a few days before the building was due to be completed, was under way. (Reporting by Guo Shipeng; Editing by Nick Macfie)

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