Photo taken on May 22, 2008 shows an aerial view of a corner of a river whose rising water level started to threat the residential zones beside it in Beichuan county, Sichuan province. About 1,800 military personnel were last night trekking toward an expanding quake lake near worst-hit Beichuan county, hoping to blast away its landslide barrier before it bursts and causes a flood. [Xinhua]

Photo taken on May 22, 2008 shows an aerial view of quake lakes formed after the May 12 earthquake in Beichuan County, southwest China's Sichuan Province. [Xinhua]

Soldiers prepare to head to the Tangjiashan quake lake on foot in a tent near Beichuan county, Sichuan province May 25, 2008. The Tangjiashan quake lake, 3.2 km upstream from the devastated Beichuan county seat, was formed because massive landslides partially blocked the Qianjiang River. [Xinhua]