A moderate earthquake Sunday toppled houses in a mountainous part of southwestern China, killing two people and injuring at least 100, state media said. According to AP, the magnitude-5.7 quake was centered near the border of Yunnan and Sichuan provinces where many Yi ethnic minority live, the official Xinhua News Agency reported. It said the casualties occurred in Yunnan's Ninglang county and Sichuan's Yanyuan county, where many houses collapsed. Rescue officials were sending tents, quilts and clothes to the affected area, it said. The U.S. Geological Survey measured the quake at magnitude 5.5.