Beijing, May 25 -- At least 82 people were killed in a gas blast at a coal mine in northern China, the state media reported.

Rescue efforts are still underway nearly a day after the blast took place, according to state broadcaster CCTV, with emergency teams descending into the Liushenyu coal mine to search for any workers trapped beneath the ground.

The blast happened some 300 meters below ground, according to CCTV. In the aftermath, the explosion site is reported to have filled with water and debris from broken walls. Rescuers are bringing water pipes and kayaks to climb down and access the scene, CNN reported.

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But their attempts have been complicated by the fact the underground map provided by the coal mining company and distributed...