Six miners who survived a gas explosion that killed 22 colleagues at a coal mine in Chongqing were still receiving medical treatment on Wednesday.

Two were in critical condition and four had slight injuries, the Chongqing Administration of Coal Mine Safety said.

The accident happened at 5:40 pm on Tuesday at Nantong Mineral, a coal production company under Chongqing Energy Investment Corp, a State-owned enterprise in Wansheng district.