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 Citizens mourn at the Paris office of Charlie Hebdo in Paris, France, Jan 7, 2015. [Photo by Chen Xiaowei/Xinhua]  | 
On Jan 7, 2015, two gunmen stormed into the Paris-based Charlie Hebdo satirical magazine offices and shot dead 12 people. An apparent associate of the shooters killed a police and four hostages held at a market in the following two days.