Armed police officers and soldiers, local people and experts work together to fill a pit caused by a cave-in on a levee in Pengze county, Jiujiang city, East China's Jiangxi province, July 20, 2010. A 2-cubic-meter pit caused by an ant hole was formed on the dike on July 20, with more than 10 infiltrations, which led to the emergency work. [Photo/Xinhua]

Armed police officers and soldiers scrutinize the dike in Pengze county, Jiujiang city, East China's Jiangxi province, July 20, 2010. [Photo/Xinhua]