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Missouri Governor Jay Nixon declared a state of emergency and curfew in Ferguson, Mo., on Saturday, following nights of protests after 18-year-old Michael Brown was shot and killed by a police officer.

"If we're going to have justice, we must first have and maintain peace," Nixon said at a Saturday afternoon press conference. "The eyes of the world are watching."

Captain Ron Johnson of the Missouri State Highway Patrol says the curfew will run from midnight to 5 a.m. local time Sunday.

"We will survive this and will make a change," Johnson says.

The developments came after armored vehicles, riot gear, tear gas and looting returned to Ferguson early Saturday as a brief period of peaceful demonstrations gave way to a violent atmosphere of anarchy.

The intense night shattered a short-lived calm that had been hailed as a turning point after a week of protests following the fatal shooting of Brown, a black unarmed teenager killed by Darren Wilson one week ago.

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