Eleven miners were killed in an accident at a coal mine in northeast China's Heilongjiang province on November 28, state media CCTV reported.
The accident occurred at 3 p.m. local time at a coal mine operated by Heilongjiang Longmay Shuangyashan Mining Co, Ltd., CCTV said.
The initial investigation found the accident was likely caused by a rock burst, it added. Rock bursts occur when built-up energy in rock suddenly releases, causing violent fracturing.
China's coal mines have seen several deadly incidents this year despite repeated government calls for stronger safety enforcement, as miners ramp up output amid high coal demand.
The country's mines are among the world's most dangerous due to complicated geological conditions and the pressure to boost production.
The accident in Heilongjiang comes just two weeks after a fire burned an office building at a coal company located in Luliang, Shanxi province, which caused 26 deaths and 38 injuries.
The incidents have kept the spotlight on safety hazards plaguing the industry.
Authorities have pledged tougher inspections and punishments for safety violations, but the string of accidents suggests more needs to be done to prevent such tragedies.
(Writing by Alex Guo Editing by Emma Yang)
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