People walk past flags flying at half mast at the presidential palace in Santiago, capital of Chile, March 7, 2010. A three-day national mourning started on Sunday for victims killed in last week's massive quake in Chile. [Xinhua]

A policeman stands guard with the national flag at half mast on the presidential palace in Santiago, capital of Chile, March 7, 2010. A three-day national mourning started on Sunday for victims killed in last week's massive quake in Chile. [Xinhua]