Photos: People mourn quake victims with air sirens wailing in grief

Relief troops mourn during a silent tribute in Mianzhu, quake-hit southwest China's Sichuan Province, May 19, 2008. Millions of people in China and overseas observed three minutes silence at 2:28 p.m. Monday to mourn thousands of people killed in an earthquake which hit the nation's southwestern regions a week ago. Across the country, air raid sirens, cars, trains and ship horns wailed in grief as the people fell silent. (Photo credit: Xinhua/Yang Ying)

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Pupils holding candles mourn during a silent tribute in Harbin, capital of northeast China's Heilongjiang Province, May 19, 2008. Millions of people in China and overseas observed three minutes silence at 2:28 p.m. Monday to mourn thousands of people killed in an earthquake which hit the nation's southwestern regions a week ago. Across the country, air raid sirens, cars, trains and ship horns wailed in grief as the people fell silent. (Photo credit: Xinhua/Li Yong)

Employees of different ethnic groups mourn during a silent tribute to the people killed in the earthquake, in Beijing, capital of China, May 19, 2008.

Donald Tsang Yam-kuen, chief executive of the HKSAR and other officials mourn during a suspension at the government headquarters in Hong Kong, south China, May 19, 2008. (Photo credit: Xinhua/Gong Lei)

The students of senior 3 at Beichuan Higher Middle School attend a ceremony of resuming classs at a temporary school in quake-hit Mianyang city, southwest China's Sichuan Province, May 19, 2008. (Photo credit: Xinhua)

People mourn during a silent tribute in Lhasa, capital of southwest China's Tibet Autonomous Region, May 19, 2008. (Photo credit: Xinhua/Gesang Dawa)