Technicians of power supply company work at Jinshangou Coal Mine in Yongchuan District of Chongqing, southwest China, Oct. 31, 2016. Rescuers are working around the clock to search for 20 miners who have remained trapped in a colliery in Chongqing for nearly 24 hours following a gas explosion. Thirteen miners have been confirmed dead as of Monday midnight. (Photo/Xinhua)
