A gas leak at a coal mine in northeast China has killed 12 miners, state media reported Monday.
The accident occurred around 11 a.m. local time on Sunday in the city of Baishan in the northeastern province of Jilin, Xinhua reported.
Rescuers brought one injured person to a hospital and confirmed Monday morning that the other 12 trapped miners were dead.
The cause of the accident in under investigation. Carbon monoxide is typically the main component of noxious gases that leak from coal deposits, and they must be dispersed before poisoning miners or exploding.
China’s mines had long been the world’s deadliest, but safety improvements have reduced deaths in recent years. However, industrial safety standards are often flouted.
China plans to close scores of mines in regions such as Jilin to reduce overcapacity in the steel and coal industries, causing the loss of hundreds of thousands of jobs.
China is the world’s largest coal producer and colliery accidents killed 931 people in 2014, according to official data.