Levels of carbon monoxide – a highly toxic, odourless gas – had ‘exceeded limits’ at the mine where over 200 people were working

The accident took place at 9.43 pm (local time) at the Liushenyu coal mine in Qinyuan County of Changzhi City. | World News

At least four people are dead and 90 others are trapped underground after carbon monoxide levels “exceeded limits” in a coal mine in northeast China on Friday night, according to…