Four people have been confirmed dead, and six others remain missing after an explosion ripped through a workshop on Saturday at a biotech company in Lianyungang City, east China's Jiangsu Province. The blast caused some parts of the facility to collapse.
One person has been rescued, local authorities announced at a press conference on Sunday.
A total of 135 firefighters have taken part in the rescue operations, which are still ongoing.
The factory has been closed, and chemicals have been contained. No leakage has been reported.
The environment department said the quality of air and water around the facility is within normal range.
The cause of the accident has yet to be determined. Investigation is currently underway.