Seven miners have been killed in an explosion at a coal mine in southwest China, state-run media reported. The blast occurred at about 2 a.m. local time at the Huangshuiba Coal Mine in the town of Yumo in the Guizhou Province, where 50 miners were working, the state-run (Xinhua) news agency reported, citing local officials. Rescuers pulled 45 miners out of mine, including two who later died from injuries sustained in the blast. The bodies of five miners were found near the blast site, according to Xinhua. The cause of the accident was under investigation, authorities said.