A ST. LOUIS County grand jury has brought no criminal charges against Darren Wilson, a white police officer who fatally shot Michael Brown, an unarmed African-American teenager, more than three months ago in nearby Ferguson, Mo.

The decision was announced Monday night by the St. Louis County prosecutor, Robert P. McCulloch, at a news conference packed with reporters from around the world.

The killing on a residential street in Ferguson set off civil unrest — and a national debate — fueled by protesters’ outrage over what they called a pattern of police brutality against young black men.

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