August 16, 2014: Police in riot gear prepare to take up positions as people protest the police shooting death of Michael Brown a week ago in Ferguson, Mo. (AP Photo/Charlie Riedel)
Police fired smoke canisters in an effort to disperse approximately 200 protesters who were defying a curfew early Sunday in a St. Louis suburb where a black teenager was fatally shot by a white police officer last week.
Hundreds of other protesters left peacefully before the midnight-to-5 a.m. curfew took effect in Ferguson, Mo., but remaining protesters -- chanting "No justice! No curfew!" -- refused to leave the area.
As five armored tactical vehicles approached the crowd, officers spoke through a loudspeaker: "You are in violation of a state-imposed curfew. You must disperse immediately. Failure to comply, may result in arrest."
As officers put on gas masks, a chant from the distant crowd emerged: "We have the right to assemble peacefully." A moment later, police began firing smoke into the crowd.
Highway Patrol Spokesman Lt. John Hotz told the Associated Press, "Obviously, we're trying to give them every opportunity to comply with the curfew." He said police only used smoke, not tear gas.
But some protesters disagreed, saying their faces and eyes burned. Others screamed in pain.
Jayson Ross, who was leading the protesters toward police, said: "They got guns. We got guns. We are ready."
The St. Louis Post-Dispatch reported that St. Louis Alderman Antonio French, who has taken part in demonstrations all week, told reporters that he believed the police had fired tear gas, but also said that their tactics "were a lot better" than they could have been.
The curfew had been announced by Missouri Gov. Jay Nixon Saturday afternoon in an effort to prevent the violence and looting that had marred earlier protests over the death of 18-year-old Michael Brown. The governor also declared a state of emergency.
Hundreds of protesters had gone home before the curfew took effect. Stormy weather and the urgings of protest leaders made the decision easier for some.
As midnight approached, New Black Panther Party leader Malik Shabazz roamed the street with a bullhorn, encouraging people to leave for their own safety.
"C'mon you all, let's roll out," Shabazz said through his bullhorn. "Let's roll out of here, get some rest and come back tomorrow."
A woman from the group walked the street with a bullhorn, telling the crowd: "Please, please be out of the area by 12 o'clock." Some responded to her pleas by cursing at police, while others acknowledged they planned to leave before midnight. Scores of officers, a much more visible presence than the night before, stood watch -- including some with shields.
Keyon Watkins, a 26-year-old computer science worker from St. Louis, said that if many others stay in the street, he would join them.
"All of this is just building up -- pent-up aggression by being mistreated on a daily basis," Watkins said.
In announcing the curfew, Nixon said that though many protesters were making themselves heard peacefully, the state would not allow looters to endanger the community.
"I am committed to making sure the forces of peace and justice prevail," Nixon said during a press conference at a church that was interrupted repeatedly by people objecting to the curfew and demanding that the officer who shot Brown be charged with murder.
"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."
Darrell Alexander, 57, a registered nurse from nearby Florissant, Missouri, worried Saturday night that the curfew might spur anger and more violence.
"I think it's an antagonistic decision to not allow people to express their freedom of speech. It's an overreaction," he said.
Nixon's curfew announcement came after tensions again flared in Ferguson late Friday night. Earlier that day, local police identified the officer who shot Brown as Darren Wilson and released documents and video footage alleging that Brown had robbed a convenience store just before he was shot. Police said Wilson was unaware Brown was a suspect when he encountered him walking in the street with a friend.
Law enforcement officials tell Fox News that the footage of Brown in the convenience store was released by local authorities over the Justice Department's objections. One official told Fox News that federal authorities had their own copy of the tape and did not intend to make it public.
Missouri State Highway Patrol Capt. Ron Johnson, who is in charge of security in Ferguson, said 40 FBI agents were going door-to-door in the neighborhood starting Saturday, talking to people who might have seen or have information about the shooting.
Johnson assured those at the news conference that police would not enforce the curfew with armored trucks and tear gas but would communicate with protesters and give them ample opportunity to leave. Nixon and Johnson were flanked by numerous local elected officials, including U.S. Rep. William Lacy Clay Jr., who urged Johnson to be flexible with the midnight curfew.
But they were interrupted repeatedly.
"Why is the focus on security and not getting justice? Why is there not an arrest?" one women yelled.
Brown's death had already ignited several days of clashes with furious protesters. Tensions eased Thursday after Nixon turned oversight of the protests over to the Missouri Highway Patrol. Gone were the police in riot gear and armored vehicles, replaced by the new patrol commander who personally walked through the streets with demonstrators. But Friday night marked a resurgence of unrest.
On Saturday, some residents said it appeared the violent acts were being committed by people who came from other suburbs or states.
"Who would burn down their own backyard?" asked Rebecca McCloud, a local who works with the Sunshine Baptist Church in St. Louis. "These people aren't from here. They came to burn down our city and leave."
Local officers faced strong criticism earlier in the week for their use of tear gas and rubber bullets against protesters. Johnson said one tear gas canister was deployed Friday night after the group of rioters became unruly and several officers got trapped and injured.
Wilson, the officer who shot Brown, is a six-year police veteran who had no previous complaints against him, the local police chief has said.
The Ferguson Police Department has refused to say anything about Wilson's whereabouts, and Associated Press reporters were unable to contact him at any addresses or phone numbers listed under that name in the St. Louis area.
Wilson has been on paid administrative leave since the shooting. St. Louis County prosecutor Bob McCulloch said it could be weeks before the investigation wraps up.
Fox News' Jake Gibson and The Associated Press contributed to this report.