Officials in Dafang County in Guizhou Province said on a local government website that those killed had been trapped inside the Qishanyan Tunnel after the Tuesday afternoon blast. -
It took rescue teams 14 hours to recover the victims, most of them migrant workers, in an effort that ended early Wednesday.
High levels of the deadly gas carbon monoxide hampered the rescue.
The injured were taken to a hospital and the cause of the explosion was under investigation. Coal seams can emit methane, an explosive natural gas.Source: Press TV