Chinese President Xi Jinping has called for an all-out effort to rescue the missing and an investigation of the accident’s cause while holding those responsible accountable, according to Xinhua.

Shanxi province is known as China’s main coal mining province. With a size larger than Greece and a population of around 34 million, the province’s hundreds of thousands of miners dug 1.3 billion tons (1.17 billion metric tons) of coal last year, or almost a third of China’s total. 

China has ⁠significantly ‌reduced coal mine fatalities – often caused ​by gas explosions or flooding – ‌since the early 2000s through more stringent regulations and safer practices. The Liushenyu incident, ‌though, was one ​of ​the deadliest ​reported in China in the past decade.

Executives of the company responsible for ​the mine have been detained, Xinhua ⁠reported. Earlier Xinhua had reported only eight dead, with more than 200 people safely brought to the ‌surface. ⁠It did not explain the jump in the death toll.