An explosion at a chemical factory in northern China has killed four and injured 37, state media reported Sunday, citing local authorities.

The blast occurred Saturday night in the city of Jinzhong, in northern Shanxi province, at the Yushe Chemical Co, the official Xinhua news agency said, citing a provincial government statement.

The cause of the explosion was still under investigation, the report said, adding firefighters worked through the night to put out the resulting fire.

The factory produced an array of chemicals ranging from common food additives to compounds used in making plastics and paper, according to the company website.

Two of the injured were in serious condition, the report said.

In China an average of 187 people were killed in work-related accidents on each day in the first half of this year, the government has said.

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