Health workers of Chongqing emergency medical service team give treatment to an injured person transported from the quake-hit Baoxing County in southwest China's Sichuan Province, April 21, 2013. al authorities. (Xinhua/Li Jian)

Health workers of Chongqing emergency medical service team prepare to give treatment to an injured person transported from the quake-hit Baoxing County in southwest China's Sichuan Province, April 21, 2013. al authorities. (Xinhua/Li Xin)

A health worker of Chongqing emergency medical service team carries an injured person transported from the quake-hit Baoxing County in southwest China's Sichuan Province, April 21, 2013. al authorities. (Xinhua/Li Jian)

Health workers of Chongqing emergency medical service team carry an injured person transported from the quake-hit Baoxing County in southwest China's Sichuan Province, April 21, 2013. al authorities. (Xinhua/Li Jian)

Smashed glass is pictured in the quake-hit Lingguan Town, Baoxing County in southwest China's Sichuan Province, April 21, 2013. al authorities. (Xinhua/Xue Yubin)

Damaged vehicles are pictured in the quake-hit Lingguan Town, Baoxing County in southwest China's Sichuan Province, April 21, 2013. al authorities. (Xinhua/Xue Yubin)

Health workers of Chongqing emergency medical service team wheel an injured person who was transported from the quake-hit Baoxing County to a tent in southwest China's Sichuan Province, April 21, 2013. al authorities. (Xinhua/Li Xin)