The death toll from a gas explosion at a coal mine in northern China has risen to 42, with another 27 workers still trapped.

Two miners were rescued after Saturday's blast at the Xishui coal mine near the city of Shuozhou in Shanxi province.

The explosion trapped 49 miners and collapsed a wall in a nearby shaft, trapping another 22.

The official Xinhua news agency said Sunday that police detained four owners of the mine for disregarding an order in November to suspend production because of safety problems.

China's coal mines are the deadliest in the world. Last year, more than 6,000 miners were killed in explosions and other accidents.

Some information for this report provided by AP, AFP and Reuters.