Chinese state media is reporting 19 miners have been killed in a coal mine accident in northern China.

The official Xinhua News Agency said Thursday that the accident happened Wednesday night on an underground platform.

The brief report cited the Shanxi Datong Coal Mine Group, which runs the mine.

State broadcaster CCTV said there were 129 people underground when the accident happened. The others reached safety.

China's mines had long been the world's deadliest, but safety improvements have reduced deaths in recent years.