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Two workers were killed and another seven injured on Thursday in a chemical plant explosion in south China's Guangxi Zhuang autonomous region, police said.

NANNING - At least seven people have been seriously injured on Thursday in a chemical plant blast in South China's Guangxi Zhuang autonomous region, police said.

No casualties have been reported.

An unknown number of other people were slightly injured after the accident around noon at a Hechi Chemical Industrial Group Company purification workshop in Hechi city, said an officer with the Liujia township police station in the city.

Further information is not known yet.

Rescue efforts are on-going and the cause of the accident is under investigation.

The company, a subsidiary of the state-owned China National Chemical Corporation, or ChemChina, mainly produces fertilizer with an annual production value of 800 million yuan ($127 million), according to the company's website.