A picture made available on October 5, 2012 shows rescuers digging for the children buried by a landslide in Yiliang county in southwest China's Yunnan province on October 4.

This picture taken on October 4, 2012 shows rescuers searching for victims after a landslide, triggered by sustained rains, buried a school and three farmhouses in Yiliang, southwest China's Yunnan province. All 18 school children who were buried when a landslide engulfed their primary school in remote and mountainous southwestern China have died, state media reported on October 5.

This picture taken on October 4, 2012 shows rescuers searching for victims after a landslide, triggered by sustained rains, buried a school and three farmhouses in Yiliang, southwest China's Yunnan province.

Local residents run past a landslide in Luozehe town on September 10, 2012 after two earthquakes hit Yiliang, in China's Yunnan province on Friday.

Earthquake survivors rest at an emergency relief center in Yiliang on September 9, 2012.

Deng Shuai, 14, holds a portrait of his father, who died in one of the earthquakes, after a burial ceremony on September 10, 2012.

An elderly man arrives to seek medical attention at a makeshift emergency relief center in Yiliang on September 9, 2012.

Zhou Zhanchang, a 12-year-old survivor, rests after receiving medical treatment in a tent outside a hospital on September 10, 2012.

A wall showing the Chinese characters for countryside, pictured on September 9, 2012. It was damaged by a large rock after a series of earthquakes Friday.

Villagers watch a TV news report in a temporary settlement for victims of the earthquakes in Yiliang county on September 9, 2012.

Soldiers carry children as locals follow towards a safer area after two earthquakes hit Zhaotong, Yunnan province, Sept. 7, 2012.

Chinese paramilitary police carry an injured victim evacuated from an earthquake hit Zhaotong town, in southwest China's Yunnan Province, Sept. 7.

Rescuers take a break outside a coal mine after a gas leak accident in Shizong county, Yunnan province, on November 11.

A hard hat is seen on the ground at Sizhuang Coal Mine on November 10.

Rescuers enter the coal mine on November 10.

Relatives of trapped coal miners cry outside a coal mine after a gas leak in Shizong county, Yunnan province, China, on November 10. A gas leak at a colliery in southwestern China has killed 20 miners and trapped 23 more underground, state media said on Thursday.

A rescuer stops people from approaching the entrance to a coal mine after a gas leak on November 10.