The death toll in a coal mine accident in China's Shandong province increased to 13 while eight miners still remain trapped, authorities said on Sunday.
The 74-metre-deep tunnel is blocked by a falling coal seam at both ends, reports Xinhua news agency.
Rescuers have cleared 42 metres of the tunnel as of 6 a.m. on Sunday and were working on the remaining 32 meters from both ends, the authorities said.
A total of 22 people were trapped in the tunnel after coal fell at both ends from the rock burst. Only one miner has been rescued so far.
Rock burst accidents are often caused by fractures in rocks due to mining.