More Violence in Ferguson, Missouri

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National Guard troops arrive at a mall complex that serves as staging area for the police in Ferguson, Missouri, Aug. 18, 2014.

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A police officer stands next to graffiti and a burned out Quick Time gas station in Ferguson, Missouri, August 18, 2014.

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Missouri State Highway Patrol Captain Ron Johnson (center R) greets rapper Nelly on West Florissant during ongoing protests in reaction to the shooting of teenager Michael Brown in Ferguson, Missouri, Aug. 18, 2014.