The accident happened late on Thursday after torrential rain and gusts of wind in the city of Lu’an in the eastern province of Anhui caused the collapse of the dormitory, Country Garden Holdings Co Ltd said in its official account on the Chinese social networking service Weibo.

“We have set up an emergency unit to help the government in rescue efforts. The project has also been halted and thorough checks will be done to eliminate any risks to safety,” the major Chinese developer, which is mostly engaged in residential property, said on Friday.

Among the 12 injured, three sustained serious injuries, it said.

Workplace accidents are relatively common in China, which faces problems with poor oversight and enforcement of health and safety standards.