Rescuers work in Dujiangyan city of southwest China's Sichuan Province, on May 13, 2008. A major eathquake measuring 7.8 on Richter scale jolted Wenchuan County of Sichuan Province at 2:28 p.m. on Monday. (Xinhua/Yang Lei)       Ambulances transport the injured in Dujiangyan city of southwest China's Sichuan Province, on May 13, 2008. A major eathquake measuring 7.8 on Richter scale jolted Wenchuan County of Sichuan Province at 2:28 p.m. on Monday. (Xinhua/Yang Lei)