A shoe factory collapsed in eastern China during a weekend shift, killing at least nine people and injuring more than 30, officials said Sunday.

Nine people escaped the collapse Saturday afternoon in the Zhejiang province city of Wenling. Rescuers pulled 42 people from the rubble and sent them to a hospital where nine of them died, the Wenling city government said on its microblog.

The cause of the accident was still under investigation.