Firemen rescue a girl from debris in Lushan County of Ya'an City, southwest China's Sichuan Province, April 20, 2013. At least 113 people have been killed in the 7.0-magnitude earthquake in Sichuan Province as of 4:40 p.m. on Saturday, according to the provincial seismological bureau. (Xinhua)

Firemen search for survivors in Lushan County of Ya'an City, southwest China's Sichuan Province, April 20, 2013. At least 113 people have been killed in the 7.0-magnitude earthquake in Sichuan Province as of 4:40 p.m. on Saturday, according to the provincial seismological bureau. (Xinhua)

Firemen search for survivors in debris in Lushan County of Ya'an City, southwest China's Sichuan Province, April 20, 2013. At least 113 people have been killed in the 7.0-magnitude earthquake in Sichuan Province as of 4:40 p.m. on Saturday, according to the provincial seismological bureau. (Xinhua)

Firemen search for survivors in debris in Lushan County of Ya'an City, southwest China's Sichuan Province, April 20, 2013. At least 113 people have been killed in the 7.0-magnitude earthquake in Sichuan Province as of 4:40 p.m. on Saturday, according to the provincial seismological bureau. (Xinhua)

Firemen rescue a girl from debris in Lushan County of Ya'an City, southwest China's Sichuan Province, April 20, 2013. At least 113 people have been killed in the 7.0-magnitude earthquake in Sichuan Province as of 4:40 p.m. on Saturday, according to the provincial seismological bureau. (Xinhua)

A military helicoptor takes off and will fly for the quake-hit areas of southwest China's Sichuan Province, April 20, 2013. A 7.0-magnitude earthquake earthquake hit Lushan county of Ya'an City in Sichuan at 8:02 a.m. Saturday Beijing Time. At least 113 people were confirmed dead by far. (Xinhua/Xia Rui)

 Military surgeons prepare to board on a helicopter flying for the quake-hit areas of southwest China's Sichuan Province, April 20, 2013. A 7.0-magnitude earthquake earthquake hit Lushan county of Ya'an City in Sichuan at 8:02 a.m. Saturday Beijing Time. At least 113 people were confirmed dead by far. (Xinhua/Xia Rui)

Military personnels, who carry out an rescue operation, board on helicopter flying for the quake-hit areas of southwest China's Sichuan Province, April 20, 2013. A 7.0-magnitude earthquake earthquake hit Lushan county of Ya'an City in Sichuan at 8:02 a.m. Saturday Beijing Time. At least 113 people were confirmed dead by far. (Xinhua/Xia Rui)

  Members of the People's Liberation Army Air Force (PLAAF) unload relief materia from a military helicopter at Lushan County in quake-hit Ya'an, southwest China's Sichuan Province, April 20, 2013. As of 4:00 p.m. Beijing time (GMT 0800), the PLAAF deployed 10 sorties of transport planes and helicopters for various rescue and relief work, including aerial photography, transporting and disaster situation reconnaissance.(Xinhua/Huang Shubo)

A helicopter of the People's Liberation Army Air Force (PLAAF) transports relief material at Lushan County in quake-hit Ya'an, southwest China's Sichuan Province, April 20, 2013. As of 4:00 p.m. Beijing time (GMT 0800), the PLAAF deployed 10 sorties of transport planes and helicopters for various rescue and relief work, including aerial photography, transporting and disaster situation reconnaissance. (Xinhua/Huang Shubo)

Members of the People's Liberation Army Air Force (PLAAF) unload relief materials from a military helicopter at Lushan County in quake-hit Ya'an, southwest China's Sichuan Province, April 20, 2013. As of 4:00 p.m. Beijing time (GMT 0800), the PLAAF deployed 10 sorties of transport planes and helicopters for various rescue and relief work, including aerial photography, transporting and disaster situation reconnaissance.(Xinhua/Huang Shubo)

Members of the People's Liberation Army Air Force (PLAAF) and locals unload relief materials from a military helicopter at Lushan County in quake-hit Ya'an, southwest China's Sichuan Province, April 20, 2013. As of 4:00 p.m. Beijing time (GMT 0800), the PLAAF deployed 10 sorties of transport planes and helicopters for various rescue and relief work, including aerial photography, transporting and disaster situation reconnaissance.(Xinhua/Huang Shubo)

A member of the People's Liberation Army Air Force (PLAAF) sits in a military helicopter heading toward Lushan County in quake-hit Ya'an, southwest China's Sichuan Province, April 20, 2013. As of 4:00 p.m. Beijing time (GMT 0800), the PLAAF deployed 10 sorties of transport planes and helicopters for various rescue and relief work, including aerial photography, transporting and disaster situation reconnaissance.(Xinhua/Huang Shubo)