A Chinese boy eats his lunch while sitting on muddy ground at a refugee camp for earthquake survivors who lost their houses in the May 12 earthquake in Leigu near the town of Beichuan, in southwest China's Sichuan Province, Thursday, May 29, 2008. Rain grounded helicopters and hampered work to drain a quake-created lake that is threatening to flood disaster victims.
A Chinese soldier carries an earthquake survivor on his back at refugee camp for people who lost their houses in the May 12 earthquake in Leigu near the town of Beichuan, in southwest China's Sichuan Province, Thursday, May 29, 2008.
Bottles of water pile up at a refugee camp for earthquake survivors in Leigu near the town of Beichuan, in southwest China's Sichuan Province, Thursday, May 29, 2008.
Medical workers wash themselves after disinfecting a refugee camp for earthquake survivors in Leigu near the town of Beichuan, in southwest China's Sichuan Province, Thursday, May 29, 2008.
Schoolchildren repeat after a teacher in a class at a temporary school in a refugee camp for earthquake survivors in Dujiangyan, in southwestern China's Sichuan Province, Thursday, May 29, 2008.
Chinese earthquake survivors look down on the destroyed city of Beichuan as they evacuate the area in China's Sichuan Province Wednesday, May 28, 2008. More than 150,000 people have been evacuated and dozens of villages emptied in case the newly formed Tangjiashan Lake, located about 2 miles above the devastated town of Beichuan, bursts before soldiers and engineers can drain it.
Partially submerged Yuli Town in Beichuan County, in southwest China's Sichuan Province is seen Wednesday, May 28, 2008. More and more buildings and roads in Yuli Town were submerged because of the swollen quake-created Tangjiashan Lake.
A landslide near the Tangjiashan earthquake-induced lake blows up dust in Beichuan, in southwest China's Sichuan Province on Wednesday, May 28, 2008. The lake is at risk of bursting and threatens thousands of people downstream. Some 30 excavators are working non-stop to dig a diversion channel to drain the lake, which was expected to be complete within 5 to 7 days if weather permits.