A policeman guides traffic in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, Dec. 21, 2010. Cold front brought snowfall in the city on Tuesday. Local meteorologic authority has issued yellow alarm against road icing. [Xinhua]

A child helps her grandmother to clear snow covering on the ground in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, Dec. 21, 2010. Cold front brought snowfall in the city on Tuesday. Local meteorologic authority has issued yellow alarm against road icing. [Xinhua]