According to REUTERS, four workers were killed and nine were missing after an explosion at a small coal mine in China's Guizhou province on Monday night.

The incident happened at Zimujia coal mine, run by private-owned Pannan Coal Investment Co, in Panzhou city.

According to local media reports, the cause of explosion was unclear, while rescue work was underway, with rescue work still underway.

The accident comes not long after a blast at an iron ore mining project in Liaoning that killed 11 people in June.

According to Guizhou Energy Administration file, the coal mine was ordered to rectify on some safety issues during a safety inspection conducted by local authorities in late April.

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