NEW : The death toll rises to at least 200 , some say . About 6,700 people are reported to have been injured . Chinese politician Li Jun travels to the area . The quake occurred about 70 miles from the city of Chengdu in Sichuan .
NEW : The death toll rises to at least 179 , authorities say . About 6,700 people are reported to have been injured . Chinese Premier Li Keqiang travels to the area . The quake struck about 70 miles from the city of Chengdu in Sichuan .