Volunteers at Shanghai World Expo observe a moment's silence in tribute to the victims in the Zhouqu mudslide disaster in Northwest China's Gansu province on August 15, 2010. China observed a day of national mourning on Sunday for the victims. 1,239 people have been confirmed dead and 505 are listed as missing. All entertainment performances and activities were canceled during the day at Expo Park. [Xinhua]
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