FERGUSON, MO - AUGUST 15: Governor Jay Nixon of Missouri speaks to the media on August 15, 2014 in St. Louis, Missouri. Violent protests have erupted in the city following the shooting death of Michael Brown by a Ferguson police officer on August 9th. Governor Nixon appointed Capt. Johnson to take control of security operations in the city of Fergusonm after receiving numerous complaints about the excessive show and use of force by the police against protestors and the news media covering the demonstrations. (Photo by Scott Olson/Getty Images)
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Missouri Governor Jay Nixon has declared state of emergency and a curfew in the St. Louis suburb of Ferguson, where an unarmed black teenager was shot and killed last week by police officer Darren Wilson.

Gov. Nixon made the announcement Saturday afternoon after he formally signed the order.

The curfew will last from midnight through 5 a.m. local time, according to Missouri Highway Patrol Capt. Ron Johnson, the Ferguson native who has been tasked with keeping the peace there. The curfew goes into effect starting Saturday night.

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The governor’s declaration comes after the latest night of looting and confrontations with police in Ferguson, including one group of protesters that broke into the store that the slain teenager, Michael Brown, was alleged by police to have robbed before he was shot dead.

Capt. Johnson told the crowd assembled in a Ferguson church that dozens of FBI agents had arrived in the town Saturday morning to talk to any witnesses.

Gov. Nixon during the press conference was many times drowned out by cries from the audience demanding justice, including the arrest of the officer who shot Brown.

‘‘We must first have and maintain peace. This is a test. The eyes of the world are watching,’’ Nixon said. ‘‘We cannot allow the ill will of the few to undermine the good will of the many.’’

We will update this article as more information becomes available.