A grand jury has decided not to indict the Missouri police officer whose August killing of an unarmed black teenager sparked months of protests. St. Louis County Prosecuting Attorney Robert McCulloch announced the jury's decision at an evening press conference…

With a decision by a Ferguson, Missouri, grand jury believed to be imminent, Attorney General Eric Holder is exhorting police across the nation to prepare appropriately for demonstrations and "minimize needless confrontation" with protesters.

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