A fire in a coal mine trapped 28 miners Monday in northern China, a news report said.

The fire broke out in the Fengfeng Coal Fields mine in Handan, a major coal-producing area in Hebei province, the government's Xinhua News Agency said.

Sixty-three miners were at work when the fire broke out, but 35 were rescued, the report said, citing officials.

It said the cause of the fire was under investigation.

China's coal mines are the world's deadliest, with more than 5,000 deaths reported every year in fires, floods and explosions, often blamed on indifference to safety rules or lack of required equipment.