4th unexplained explosion rocks China

The latest incident will likely raise more questions about safety standards in China, where industrial accidents are all too common following three decades of fast economic growth. A blast at an auto-parts factory killed 75 people a year ago

An explosion shook a chemical plant in the Chinese province of Zhejiang, state media said on Monday, though there were no immediate reports of casualties in a country on edge after blasts killed more than 160 people last month.

The blast caused a fire and thick smoke to bellow from the plant in Lishui city shortly before midnight, state radio said on its official Weibo microblog.

Firefighters were on the scene and there were no immediate reports of casualties.