4 dead, 90 trapped in Shanxi Province coal mine

Four people are confirmed dead and

90 remain trapped underground after carbon monoxide levels

exceeded limits in a coal mine in Changzhi City of north China's Shanxi Province, state news agency Xinhua reports.

The accident happened late Friday in the Liushenyu coal mine

in Changzhi. By early Saturday, 157 of the total 247 workers who were underground had been brought to the surface, including four dead, Xinhua said.