Two American volunteers help treat an injured person at the earthquake-hit Beichuan County, southwest China's Sichuan Province, on May 14, 2008. [Photo: Xinhua]

An American volunteer helps treat an injured person at the earthquake-hit Beichuan County, southwest China's Sichuan Province, on May 14, 2008. [Photo: Xinhua]

An American volunteer helps treat an injured person at the earthquake-hit Beichuan County, southwest China's Sichuan Province, on May 14, 2008. [Photo: Xinhua]

An American volunteer, second from left, helps carry a victim at the earthquake-hit Beichuan County, southwest China's Sichuan Province, on May 14, 2008. [Photo: Xinhua]

(Xinhua News Agency May 15, 2008)