All the 13 miners trapped by a coal mine blast in southwest China's Guizhou Province were confirmed dead, rescuers said Thursday, seven days after the accident. The last body was retrieved at 7:30 a.m. Thursday after rescuers cleaned 381,000 cubic meters of gas and 1,400 cubic meters of coal out of the shaft at Jinjia Coal Mine, Xinhua quoted a spokesman with the accident rescue and relief headquarters as saying. The accident happened around 5:30 p.m. on Jan. 18, trapping 13 at a shaft of the coal mine in Panxian County, Liupanshui City. High density of gas in the shaft had hampered rescue before the bodies were recovered. An investigation into the cause of the accident is underway.