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.

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.