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Attaullah Khan, Pakistan's director of disaster management, on May 5 said a blast caused by a buildup of methane gas in the Marwar coalfields in Balochistan Province led to the collapse of a mine, trapping many workers.

Hours later, another coal mine collapsed in Sooranj area, in which seven miners were killed.

"We are trying our best to recover bodies but it will take time as most of the bodies are buried very deep", Shahwani said.

"So far 16 dead bodies and six injured miners have been recovered from the mine", he said. On Sunday, five bodies were recovered when the rescue operation resumed. They were shifted to the Bolan Medical College Hospital's burn unit and four of them, who had suffered serious injuries, had been admitted there. However, they faced difficulties as the mouth of the mine had been blocked by a boulder after the blast.

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Accidents are frequent in the province's mines, where safety measures are basic and numerous workforce come from other parts of Pakistan.

"There were no arrangement inside the mine, including air ventilation", Akhterzada, an injured coal miner told Al Jazeera. According to Pakistan Central Mines Labour Federation (PCMLF), about 100 to 200 labourers die on average in coalmine accidents every year.

The accident took place in the Surran range coal field. The resolution demanded Rs2 million compensation for each victim of the incidents. Some labourers are reportedly still trapped under rubble of the mine, which collapsed due to a gas explosion.