At least 17 miners were killed and 30 untraced after an explosion in a mine in northern China's Shanxi province, news reports said on Monday.
Rescuers pulled out 17 bodies Monday from the Jiaojiazhai mine, near Xinzhou city, after Sunday's explosion.
The cause of the explosion is believed to be due to gas that accumulated and exploded after exhaust fans stopped working due to a power failure. The explosion caused a cave-in, hampering rescue efforts.
Rescuers are still 400 to 500 metres away from the site of the explosion. There were 393 workers in the mine at the time of the accident.
Last Tuesday, 29 miners were killed in a coal mine gas explosion in north-western Gansu province.
About 6,000 coal miners were killed in accidents in China last year, according to official figures.
Out-of-date equipment, illegal mining as well as poor safety systems and supervision are behind many accidents in China.