AlQa'dah 21, 1432, Oct 19, 2011, SPA -- A coal mine gas blast has left 13 people dead in Chongqing Municipality, local authorities said Wednesday. The accident took place at Fufa Coal Mine in Dashu Township of Fengjie County at about 1:10 p.m. Monday, when 16 miners were working underground, Xinhua quoted the Chongqing municipal government as saying in a statement. Three miners were rescued. Nine were killed instantly and four others were later found dead, according to the statement. Rescuers retrieved the bodies of four miners after two days of searching, bringing the death toll to 13, it said. Six people in connection with the accident have been detained by police, it said. Police and work safety authorities are further investigating the accident, the statement said.