Missouri Gov. Jay Nixon (D) has signed an order declaring a state of emergency and ordering a curfew in Ferguson, he announced in a press conference on Saturday.

The curfew will last from midnight to 5 a.m., according to Capt. Ronald Johnson of the Missouri State Highway Patrol, who also spoke at the press conference.

"What we're doing now is not who we are," Johnson said amid shouts from community members during the press conference.

Johnson noted there would be no trucks or tear gas used to enforce the curfew. He acknowledged that tear gas had been used against protesters early Saturday morning, but said he did not order officers to take that action.

Below, more from the AP:

FERGUSON, Mo. (AP) — Missouri Gov. Jay Nixon says he's declared a state of emergency and is implementing a curfew in the St. Louis suburb where a black teenager was shot to death by a white police officer a week ago.

Nixon said Saturday that the state will not allow a handful of looters to endanger the community and that there must be calm if justice is to be served. The curfew will run from midnight to 5 a.m.

Tensions in Ferguson flared late Friday after police released the name of the officer who fatally shot 18-year-old Michael Brown and documents alleging Brown robbed a store before he died.

Nixon also says the U.S. Department of Justice is beefing up its investigation of the shooting and there are dozens of FBI agents on the ground working on the investigation.