HANGZHOU, July 12  -- A passenger coach rolled over on Saturday along the Hangzhou-Huizhou highway in eastern China's Zhejiang Province, killing six and injuring more than 30 people, according to local traffic police.

The coach with Anhui license plate number R23460 turned on its side at 12:40 p.m. when driving down a ramp for Hangzhou, capital of Zhejiang, from Anhui Province, according to sources with the Hangzhou Highway Traffic Police.

The injured have been sent to nearby hospitals for treatment.

The cause of the accident is being investigated, police said.