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An accident in a coal mine in China's northeastern Heilongjiang province left 12 people dead and 13 injured, state broadcaster CCTV reported Thursday.

The coal workers were in a mining cart underground that ran off the tracks, according to state media reports.

OVER 100 DEAD, MANY MORE INJURED IN CHINA'S DEADLIEST EARTHQUAKE IN NEARLY A DECADE

The accident occurred Wednesday afternoon in Jixi city in Heilongjiang province at the Kunyuan mine and was reported by Chinese media on Thursday.

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China's national flag is seen in front of cranes on a construction site in a commercial district in Beijing, China, January 26, 2016. (REUTERS/Kim Kyung-Hoon - RTX240F5)

China has been working to improve mine safety to combat accidents, which happen with some frequency. Last Thursday, three people died in an accident in China's coal-producing province Shanxi. A coal mine explosion killed 11 people in Shanxi in August, and a coal mine fire in southern China’s Guizhou province killed 16 people in September.

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Last month, a major fire at a coal mining company building in Shanxi killed 26 people and injured dozens of others, but the blaze was not in the mine itself.