FENYANG, Shanxi - Twelve workers were confirmed to be trapped after flooding in a coal mine in north China's Shanxi Province early Saturday morning, the coal mine company said.

The accident occurred at 3:10 a.m. at the Zhengsheng Coal Mine of Shanxi Coking Coal Group Co., Ltd. in Fenyang City, when 42 workers were working underground.

Twelve miners remain trapped underground and 30 others were lifted out of the mine shaft safely, according to the company.

Further rescue efforts and investigation are underway.