<span style="color: #222222;">A gas explosion inside a coal mine on Wednesday killed at least four workers and seriously injured another miner in Pakistan's Balochistan province. </span><br />'' <br />'' <span style="color: #222222;">According to the Dawn newspaper report, four coal miners burnt to death as result of a methane gas blast inside a coal mine in Chamalang area of Dukki district. </span><br />'' <br />'' <span style="color: #222222;">Dukki's district police officer Sardar Hashim Khan said one coal miner sustained serious injuries as a result of the blast. </span><br />'' <br />'' <span style="color: #222222;">He said the miners were extracting coal from thousands feet inside the mine when the tragedy struck.</span><br />''