1 wounded as Police enforce curfew in Ferguson

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Police stand guard against protestors in Ferguson, Missouri in the early morning hours of August 14, 2014. Protestors demonstrated against the shooting death of Michael Brown.

FERGUSON, Mo. - Authorities say one person was shot and critically wounded and seven people were arrested as police used smoke and tear gas to impose a curfew in a St. Louis suburb where a black teen walking down the street had been shot by a white police officer.

Missouri State Highway Patrol Capt. Ron Johnson says his department's strong response early Sunday morning came after a midnight to 5 a.m. curfew took hold in Ferguson, and was precipitated by two events.

Johnson says concerns about people who'd broken into a barbecue restaurant and taken position on the roof overlooking approaching police was one concern. He says another concern involved a man flashing a handgun appeared in the middle of the street as armored vehicles approached.

Johnson says someone also fired at a patrol car, but no officers were injured.

Michael Brown 18, was shot on Aug. 9, prompting protests, unrest and claims of civil rights violations.

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