FERGUSON, Mo. (AP) — The unarmed teenager whose fatal shooting by police ignited days of heated protests in suburban St. Louis was suspected of stealing cigars and pushing a clerk at a nearby convenience store earlier that day, police said Friday.

Ferguson Police Chief Thomas Jackson released several police reports and documents during a news conference where he also identified the officer involved as Darren Wilson, who has been on administrative leave since the shooting of 18-year-old Michael Brown on Aug. 9.

According to the police reports, Brown and his friend, Dorian Johnson, were suspected of taking a box of cigars from a store in Ferguson that morning. Jackson said Wilson, along with other officers, was called to the area after a 911 call reporting a "strong-arm" robbery just before noon. He said a dispatcher gave a description of the robbery suspect, and Wilson, who had been assisting on another call, was sent to investigate.

Wilson, a six-year veteran of the police department, encountered Brown just after 12:01 p.m., with a second officer arriving three minutes later, Jackson said.

Police have said Brown was shot after an officer encountered him and another man on the street. They say one of the men pushed the officer into his squad car, then physically assaulted him in the vehicle and struggled with the officer over the officer's weapon. At least one shot was fired inside the car before the struggle spilled onto the street, where Brown was shot multiple times, according to police.

Dorian Johnson has told media very different story. He has said he and Brown were walking in the street when an officer ordered them out of the street, then grabbed his friend's neck and tried to pull him into the car before brandishing his weapon and firing. He said Brown started to run and the officer pursued him, firing multiple times.

Brown's death has sparked several days of clashes with furious protesters in the city. Tensions boiled over after a candlelight vigil Sunday night, as looters smashed and burned businesses in the neighborhood, where police have repeatedly fired tear gas and smoke bombs.

But on Thursday, county police in riot gear and armored tanks gave way to state troopers walking side-by-side with thousands of peaceful protesters. The dramatic shift came after Gov. Jay Nixon assigned oversight of the protests to the state Highway Patrol, stripping that authority from the St. Louis County Police Department.

"All they did was look at us and shoot tear gas," Pedro Smith, who has participated in the nightly protests, said Thursday. "This is totally different. Now we're being treated with respect."

The more tolerant response came as President Barack Obama spoke publicly for the first time about the shooting — and the subsequent violence that shocked the nation and threatened to tear apart Ferguson, a town of 21,000 that is nearly 70 percent black and patrolled by a nearly all-white police force.

Obama said there was "no excuse" for violence either against the police or by officers against peaceful protesters.

Nixon's promise to ease the deep racial tensions was swiftly put to the test as demonstrators gathered again Thursday evening. But the latest protests had a light, almost jubilant atmosphere among the racially mixed crowd, more akin to a parade or block party.

The streets were filled with music, free food and even laughter. When darkness fell — the point at which previous protests have grown tense — no uniformed officers were in sight outside the burned-out QuikTrip convenience store that had become a flashpoint for standoffs between police and protesters.

"You can feel it. You can see it," protester Cleo Willis said of the change Thursday. "Now it's up to us to ride that feeling."

Nixon appointed Highway Patrol Capt. Ron Johnson, who is black, to lead the police effort. Johnson, who grew up near Ferguson and commands a region that includes St. Louis County, marched alongside protesters Thursday, joined by other high-ranking brass from the Highway Patrol as well as the county department. The marchers also had a police escort.

"We're here to serve and protect," Johnson said. "We're not here to instill fear."

Attorney General Eric Holder has said federal investigators have interviewed witnesses to the shooting.

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Associated Press writers Jim Salter and Jim Suhr in St. Louis, Eric Tucker in Washington and Hillel Italie in New York, and AP researcher Rhonda Shafner, also in New York, contributed to this report.

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Follow Alan Scher Zagier on Twitter at http://twitter.com/azagier .