Pupils holding candles mourn during a silent tribute in Harbin, capital of northeast China's Heilongjiang Province, on May 19, 2008. Millions of people in China and overseas observed three minutes silence at 2:28 PM 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. [Xinhua]