Two sons of local resident He Jian sleep in a tricycle cart along the roadside of the Sichuan-Tibet Highway. A 7.0-magnitude earthquake hit Lushan county on the morning of April 20. Longmen, Baosheng and Taiping townships were the worst hit areas. Victims spent their first night after the quake in temporary tents along the roadside. Photo: Xing Guangli/Xinhua

Earthquake victims spend the night in temporary tents on April 21. A 7.0-magnitude earthquake hit Lushan county on the morning of April 20. Longmen, Baosheng and Taiping townships were the worst hit areas. Victims spent their first night after the quake in temporary tents along the roadside. Photo: Xiao Jiuyi/Xinhua

Earthquake victims rest at the roadside of Lushan county on April 21. A 7.0-magnitude earthquake hit Lushan county on the morning of April 20. Longmen, Baosheng and Taiping townships were the worst hit areas. Victims spent their first night after the quake in temporary tents along the roadside. Photo: Xiao Jiuyi/Xinhua

Residents from Yuxi village, part of Baosheng township, Lushan county spend the night in temporary tents on April 20. A 7.0-magnitude earthquake hit Lushan county on the morning of April 20. Longmen, Baosheng and Taiping townships were the worst hit areas. Victims spent their first night after the quake in temporary tents along the roadside. Photo: Fei Maohua/Xinhua

Residents from Yuxi village, part of Baosheng township, Lushan county spend the night in temporary tents on April 20. A 7.0-magnitude earthquake hit Lushan county on the morning of April 20. Longmen, Baosheng and Taiping townships were the worst hit areas. Victims spent their first night after the quake in temporary tents along the roadside. Photo: Fei Maohua/Xinhua

An earthquake victim rests at the roadside of Lushan county on April 21. A 7.0-magnitude earthquake hit Lushan county on the morning of April 20. Longmen, Baosheng and Taiping townships were the worst hit areas. Victims spent their first night after the quake in temporary tents along the roadside. Photo: Xiao Jiuyi/Xinhua

Earthquake victims rest at the roadside of Lushan county on April 21. A 7.0-magnitude earthquake hit Lushan county on the morning of April 20. Longmen, Baosheng and Taiping townships were the worst hit areas. Victims spent their first night after the quake in temporary tents along the roadside. Photo: Luo Xiaoguang/Xinhua

Residents of Longmen township, Lushan county rest in a temporary shelter on April 20. A 7.0-magnitude earthquake hit Lushan county on the morning of April 20. Longmen, Baosheng and Taiping townships were the worst hit areas. Victims spent their first night after the quake in temporary tents along the roadside. Photo: Liu Jinhai/Xinhua

Volunteers provide hot porridge for earthquake victims and rescue team staff at a resettlement point in Lushan Gymnasium. A 7.0-magnitude earthquake hit Lushan county on the morning of April 20. Longmen, Baosheng and Taiping townships were the worst hit areas. Photo: Chen Cheng/Xinhua

Earthquake victims rest at the roadside of Lushan county on April 21. A 7.0-magnitude earthquake hit Lushan county on the morning of April 20. Longmen, Baosheng and Taiping townships were the worst hit areas. Victims spent their first night after the quake in temporary tents along the roadside. Photo: Xiao Jiuyi/Xinhua