An unarmed black teenager shot dead by an officer was a suspect in a "strong-arm" robbery minutes before the fatal confrontation, say police.
Michael Brown, 18, allegedly stole cigars and shoved a clerk at a convenience store in suburban St Louis last Saturday, just before he was killed by a police officer, spawning almost a week of public disorder.
Ferguson Police Chief Thomas Jackson released the police reports and documents on Friday morning as he named the officer who carried out the shooting.
Police say Michael Brown was a suspect in a robbery before he was shot
Darren Wilson, who has six years' service and no disciplinary record, is on administrative leave following the incident.
According to the police reports, Mr Brown and his friend, Dorian Johnson, were suspected of taking a $48.99 box of Swisher Sweet Cigars from a store in Ferguson that morning.
State Highway Patrol captain, Ron Johnson, has taken over security
Chief Jackson said Officer Wilson encountered Mr Brown about 10 minutes after the robbery, at around 12:01pm.
But a lawyer for the Brown family said they are "incensed" because they feel the police are trying to smear their son.
Protesters chant during Thursday's peaceful demonstration
Attorney Benjamin Crump said: "It's bad enough they assassinated him, and now they're trying to assassinate his character."
Police have previously said the officer at the centre of the investigation opened fire after he was pushed into his squad car by one of two men he encountered on the street.
They then assaulted him in the vehicle and struggled with the policeman over the officer's weapon, according to Ferguson police.
Ferguson protesters ride on a car
A shot was fired inside the car before Mr Brown was shot multiple times, according to police.
Dorian Johnson, 22, has been telling media a sharply different version of events.
Vigils were also held in more than 90 cities across the country on Thursday
He said he and Mr Brown were ordered by an officer to stop walking in the street. Mr Johnson said the officer then tried to pull Mr Brown into the squad car before pulling his weapon and firing as the teen had his hands up.
The developments emerged the morning after hundreds of protesters marched side by side with officers in a dramatic turnabout, following a law enforcement facelift in Ferguson.
Some Los Angeles residents also rallied to demand justice for Michael Brown
Gone were the officers in riot gear and armoured tanks as Missouri State Highway Patrol and its black captain Ron Johnson were appointed by the governor to take control of security.
Capt Johnson, who grew up in the community, told a Friday news conference that law enforcement did not use tear gas or make any arrests in the town the night before.
Police officers shook hands with protesters in Ferguson on Thursday night
Marchers had stopped to shake hands with police and troopers, in marked contrast to the previous four nights of violent demonstrations which drew a rebuke from President Barack Obama about "excessive force" by police.
"This is totally different," one demonstrator, Pedro Smith, 41, told Reuters news agency. "Now we're being treated with respect."
Vigils were also held in more than 90 cities across the country to observe a National Moment of Silence on Thursday night.
Witnesses have said Michael Brown had his hands up when he was shot
Rallies took place in Detroit, Los Angeles and New York, where people were asked to wear a red ribbon, cloth or bandana as a mark of solidarity.