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The St. Louis County executive declared a state of emergency in Ferguson, Mo., on Monday as officials and activists sought to regain control of the volatile streets after plainclothes police officers shot and critically wounded an 18-year-old black man who they said was firing on them late the night before.

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A woman yells to the crowd during a civil disobedience action on West Florissant Avenue in Ferguson, Missouri.Michael B. Thomas/AFP / Getty Images

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A police officer directs onlookers as a man is detained during a civil disobedience action on West Florissant Avenue in Ferguson, Missouri.Michael B. Thomas/AFP / Getty Images

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An anti-police demonstrators screams at a St Louis County police officers during protests in Ferguson, Missouri.Lucas Jackson/Reuters

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Demonstrators, marking the one-year anniversary of the shooting of Michael Brown, protest along West Florrisant Street in Ferguson, Missouri.Scott Olson/Getty Images

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Police officers form a line as they monitor a civil disobedience action on West Florissant Avenue in Ferguson, Missouri.Michael B. Thomas/AFP / Getty Images

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Members of the Oath Keepers walk with their personal weapons on the street during protests in Ferguson, Missouri.Lucas Jackson/Reuters

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St. Louis County Police officers, outfitted in tactical equipment, monitor the situation during a civil disobedience action on West Florissant Avenue in Ferguson, Missouri.Michael B. Thomas/AFP / Getty Images

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Demonstrators, marking the one-year anniversary of the shooting of Michael Brown, protest along West Florrisant Street in Ferguson, Missouri.Scott Olson/Getty Images

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Officers and protesters face off along West Florissant Avenue in Ferguson, Missouri.Jeff Roberson/The Associated Press

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A man gestures as police look on during a civil disobedience action on West Florissant Avenue in Ferguson, Missouri.Michael B. Thomas/AFP / Getty Images

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