Residents watch as rescuers work at the rubble of a collapsed high school in the township of Hanwang in Mianzhu city in Sichuan province late May 14, 2008. At least one survivor is seen trapped in the rubble. China poured more troops into the earthquake-ravaged province of Sichuan on Wednesday to speed up the search for survivors as time ran out for thousands of people buried under rubble and mud. [Agencies]