AlQa'dah 11, 1433, Sep 27, 2012, SPA -- 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. The accident happened around noon at a purification workshop ran by the Hechi Chemical Industrial Group Company in the city of Hechi, said Li Chunqi, deputy general manager of the company. The injured have been taken to a local hospital for treatment, Li said, adding that their injuries are not life-threatening. An initial investigation indicated that the blast was caused by a gas leak. A further investigation is under way, Xinhua reported.