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Police corral protesters before detaining them during a march on Wednesday in Los Angeles, California, following Monday's grand jury decision in the shooting of Michael Brown in Ferguson,Missouri. Some 2,000 National Guard troops helped ward off a second night of rampant arson and looting in suburban St. Louis after the grand jury declined to indict a white policeman in the fatal shooting of the unarmed black teenager, and sympathy protests spread to several US cities.  Lucy Nicholson / Reuters