HANGZHOU - Four workers have died and another two were hospitalized after being poisoned on Saturday in a plant in Dongyang, East China's Zhejiang province, local authorities confirmed Sunday.

Around 1 pm Saturday, one worker was poisoned when he was cleaning up the plating cesspool in the Jinluoma Development Co Ltd. Another five people were also poisoned during rescue efforts, said the publicity department of Dongyang.

As of noon on Sunday, four workers had died in hospital due to cyanide poisoning. Another two people hospitalized were in stable condition.

Local authorities have initiated safety checks for all electroplating and chemical plants in Dongyang.

Investigation is underway to find the detail cause of the accident.