Photo taken on March 30, 2013 shows the exterior where a gas blast happened at Babao Coal Mine in Jiangyuan District in the city of Baishan, Northeast China's Jilin Province. Twenty-eight people were confirmed dead and 13 others injured during the colliery gas blast which happened around 10:40 pm (1440 GMT) on March 29. The injuries of the 13 were not life threatening, said a spokesman with the provincial work safety and supervision bureau. Rescue work has been finished, and the cause of the accident is under investigation. (Xinhua/Xu Chang)

Photo taken on March 30, 2013 shows the clothes-changing area of the mine where a gas blast happened at Babao Coal Mine in Jiangyuan District in the city of Baishan, Northeast China's Jilin Province. Twenty-eight people were confirmed dead and 13 others injured during the colliery gas blast which happened around 10:40 pm (1440 GMT) on March 29. The injuries of the 13 were not life threatening, said a spokesman with the provincial work safety and supervision bureau. Rescue work has been finished, and the cause of the accident is under investigation. (Xinhua/Xu Chang)

A nurse is seen working in a hospital receiving injured miners in Baishan, Northeast China's Jilin Province, March 30, 2013. Twenty-eight people were confirmed dead and 13 others injured in a gas blast at Babao Coal Mine in Jiangyuan District in the city of Baishan around 10:40 pm (1440 GMT) late Friday. The injuries of the 13 were not life threatening, said a spokesman with the provincial work safety and supervision bureau. Rescue work has been finished, and the cause of the accident is under investigation. (Xinhua/Xu Chang)

A relative of an injured miner is seen on the phone in a hospital in Baishan, Northeast China's Jilin Province, March 30, 2013. Twenty-eight people were confirmed dead and 13 others injured in a gas blast at Babao Coal Mine in Jiangyuan District in the city of Baishan around 10:40 pm (1440 GMT) late Friday. The injuries of the 13 were not life threatening, said a spokesman with the provincial work safety and supervision bureau. Rescue work has been finished, and the cause of the accident is under investigation. (Xinhua/Xu Chang)

Relatives of injured coal miners wait in a hospital in Baishan, Northeast China's Jilin Province, March 30, 2013. Twenty-eight people were confirmed dead and 13 others injured in a gas blast at Babao Coal Mine in Jiangyuan District in the city of Baishan around 10:40 pm (1440 GMT) late Friday. The injuries of the 13 were not life threatening, said a spokesman with the provincial work safety and supervision bureau. Rescue work has been finished, and the cause of the accident is under investigation. (Xinhua/Xu Chang)