Chemical plant explosion kills four in South Korea

At least four people have been killed in a blast at a chemical plant in South Korea. Owners of Ulsan's Hanwha Chemical Corp said that the explosion took place during welding work to expand a waste water disposal facility, reported the BBC.

A fire brigade official said that gas from the waste water, which had piled up inside the tank, caught fire from the welding torch. Meanwhile, a probe to determine if the explosion was caused by negligence is under way.

The plant manufactured polyvinyl chloride used in wide range of products, such as cling film. 

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