The explosion occurred late on Friday at the Liushenyu coal mine in Qinyuan County, where 247 workers were on duty underground at the time of the accident, according to state news agency Xinhua. Rescue operations were continuing on Saturday as authorities worked to locate remaining workers and assess conditions at the site.

The mine is operated by Shanxi Tongzhou Group Liushenyu Coal Industry, a company established in 2010 and controlled by Shanxi Tongzhou Coal Coking Group, according to corporate records.Local emergency management authorities said the cause of the explosion remained under investigation.

Shanxi, China’s leading coal-producing region, has long been at the center of the country’s mining industry and has experienced numerous major industrial accidents over the decades.President Xi Jinping ordered authorities to spare no effort in treating the injured and conducting search-and-rescue operations, according to Xinhua.

He also called for a comprehensive investigation into the disaster and accountability for those found responsible under the law.Premier Li Qiang urged officials to ensure the timely release of information and enforce rigorous accountability measures as investigations proceed.

Xinhua reported that executives linked to the company operating the mine had been detained following the accident.Provincial authorities dispatched seven rescue and medical teams comprising 755 personnel to the disaster site, according to Qinyuan’s emergency management bureau.

China has significantly reduced fatalities in its coal mining sector over the past two decades through stricter safety regulations, modernization efforts and tougher enforcement standards.

Nevertheless, gas explosions and other underground hazards continue to pose risks in some mining operations.

The previous deadliest coal mining disaster in China occurred in 2009, when a coal and gas outburst at a mine in Heilongjiang province killed 108 people and injured 133.