The blast in the Marwar coalfields in Baluchistan province was caused by a build-up of methane gas inside the mine, director of disaster management Attaullah Khan said.
Around three hours later, a mine 25 kilometres (16 miles) to the west at Spin Carez collapsed in similar circumstances, killing seven of the nine miners inside. Rescue operations have been completed at both sites, and the explosions were not linked. The bodies of five more miners, who were trapped in the mine, were recovered later, increasing the death toll to seven.
About 16 mine workers of dead bodies were pulled out from the coalmine after collapsing mine roof in gas explosion by local rescue teams including law enforcement agencies after hectic efforts under monitoring of provincial officials. However, they faced difficulties as the mouth of the mine had been blocked by a boulder after the blast.
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They said lack of safety arrangements inside the two mines, including air ventilation, had caused the fatal incidents. At least 15 more miners were injured in the two incidents.
The demonstration culminated with the adoption of a resolution by the participants, calling on Chief Justice of Pakistan Mian Saqib Nisar to take suo motu notice of the mine accidents.
The Pakistan Central Mines Labour Federation says that up to 200 mine workers die on average in mine accidents every year. Some labourers are reportedly still trapped under rubble of the mine, which collapsed due to a gas explosion.