Authorities say one person was shot and critically wounded and seven people arrested early Sunday morning as police used smoke and tear gas to enforce a curfew in the U.S. town of Ferguson, Missouri.
Missouri Police Use Smoke, Tear Gas on Protesters

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A law enforcement officers check a building, Aug. 17, 2014, after tear gas was fired to disperse protesters in Ferguson.

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Demonstrators weep on each others shoulders as masked individuals break into a store in Ferguson, Aug. 16, 2014.

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Masked individuals carry items out of a store in Ferguson, Aug. 16, 2014.

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Missouri Governor Jay Nixon declares a state of emergency and curfew in response to looting the previous night in Ferguson, Aug. 16, 2014.