Photo taken on July 16, 2013 from a helicopter shows a road to Caopo Village damaged by mudslide in Wenchuan County, southwest China's Sichuan Province. The People's Liberation Army (PLA) Chengdu Military Area Command has dispatched helicopters to help with relief work in Wenchuan County which has been affected by flooding. An aviation unit dispatched three helicopters with 19 relief workers and 7.5 tonnes of materials in 12 flights to Caopo Township of Wenchuan County, which suffered downpours and mud-rock flows, according to the area command. Photo: Xinhua

Local residents help relief workers unload disaster-relief supplies from a helicopter in Caopo Township of Wenchuan County, southwest China's Sichuan Province, July 16, 2013. The People's Liberation Army (PLA) Chengdu Military Area Command has dispatched helicopters to help with relief work in Wenchuan County which has been affected by flooding. An aviation unit dispatched three helicopters with 19 relief workers and 7.5 tonnes of materials in 12 flights to Caopo Township of Wenchuan County, which suffered downpours and mud-rock flows, according to the area command. Photo: Xinhua

Relief workers transfer an injured child to a helicopter in Caopo Township of Wenchuan County, southwest China's Sichuan Province, July 16, 2013. The People's Liberation Army (PLA) Chengdu Military Area Command has dispatched helicopters to help with relief work in Wenchuan County which has been affected by flooding. An aviation unit dispatched three helicopters with 19 relief workers and 7.5 tonnes of materials in 12 flights to Caopo Township of Wenchuan County, which suffered downpours and mud-rock flows, according to the area command. Photo: Xinhua

Relief workers unload disaster-relief supplies from a helicopter in Caopo Township of Wenchuan County, southwest China's Sichuan Province, July 16, 2013. The People's Liberation Army (PLA) Chengdu Military Area Command has dispatched helicopters to help with relief work in Wenchuan County which has been affected by flooding. An aviation unit dispatched three helicopters with 19 relief workers and 7.5 tonnes of materials in 12 flights to Caopo Township of Wenchuan County, which suffered downpours and mud-rock flows, according to the area command. Photo: Xinhua

Local residents carry disaster-relief supplies from a helicopter in Caopo Township of Wenchuan County, southwest China's Sichuan Province, July 16, 2013. The People's Liberation Army (PLA) Chengdu Military Area Command has dispatched helicopters to help with relief work in Wenchuan County which has been affected by flooding. An aviation unit dispatched three helicopters with 19 relief workers and 7.5 tonnes of materials in 12 flights to Caopo Township of Wenchuan County, which suffered downpours and mud-rock flows, according to the area command. Photo: Xinhua

A helicopter arrives at a settlement site in Caopo Township of Wenchuan County, southwest China's Sichuan Province, July 16, 2013. The People's Liberation Army (PLA) Chengdu Military Area Command has dispatched helicopters to help with relief work in Wenchuan County which has been affected by flooding. An aviation unit dispatched three helicopters with 19 relief workers and 7.5 tonnes of materials in 12 flights to Caopo Township of Wenchuan County, which suffered downpours and mud-rock flows, according to the area command. Photo: Xinhua

Relief workers transfer an injured person to a helicopter in Caopo Township of Wenchuan County, southwest China's Sichuan Province, July 16, 2013. The People's Liberation Army (PLA) Chengdu Military Area Command has dispatched helicopters to help with relief work in Wenchuan County which has been affected by flooding. An aviation unit dispatched three helicopters with 19 relief workers and 7.5 tonnes of materials in 12 flights to Caopo Township of Wenchuan County, which suffered downpours and mud-rock flows, according to the area command. Photo: Xinhua