An explosion at an industrial park in Yancheng, east China’s Jiangsu Province, killed six people and seriously injured 30 others on Thursday afternoon.
Medical workers are treating the wounded and the environmental protection department is monitoring the air.
The cause of the accident is under investigation.
Xinhua News Agency reported earlier that workers were trapped after buildings were knocked down by the shockwave, which also shattered windows of nearby residential houses.
Witnesses said many workers were seen running out of the factory covered in blood after the blast.
The government of Xiangshui county said the explosion happened at about 2:48 p.m. following a fire that broke out in a factory that produces pesticides located in a chemical industrial park.
The firefighter brigade of Jiangsu said they had mobilized 86 fire trucks to join the rescue mission.
(With input from Xinhua)