A gas blast at a coal mine in southern China killed 13 miners, leaving three others missing, the State Administration of Work Safety said on its Web site. Forty-nine miners were working underground when the explosion occurred at 1:30 a.m. in Guizhou province, the agency said. Thirty-three people escaped, including four who were injured, the report said. In northern China today, the death toll from a coal mine explosion on November 28 climbed to 166 after all the remaining trapped miners were declared dead.