Pedestrians walk by as armed policemen of the Snow Leopard Commando Unit (L) stand guard near a police van at the Sanlitun area, a fashionable location for shopping and dining, in Beijing, China, December 24, 2015. U.S. Embassy in China issued a notice on its website on Thursday warning people about possible threads against westerners in this area on or around Christmas Day. REUTERS/Jason Lee
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