Riots broke out late Sunday near St. Louis after an unarmed black teen was shot to death during a struggle with a police officer in Ferguson, Missouri. Businesses were looted, cars were vandalized and a convenience store was set ablaze when a vigil for 18-year-old Michael Brown spiraled out of control.

Roche Madden of FOX affiliate KTVI reported from the scene on Fox and Friends, saying at least 12 businesses were looted and the final total is expected to go much higher.

At least two police officers were hurt, with hundreds of officers in riot gear deployed. One of the officers was hit in the head with a brick, but neither of the injuries are life-threatening, Madden said.

More than 30 arrests have been reported so far.

In the video above, you can see looting taking place at a shoe store and an ATM machine ransacked.

More on the riots from FoxNews.com:

What began as a peaceful protest of the shooting of an 18-year-old unarmed black man by a police officer in a St. Louis suburb turned into what the town's mayor called a "huge mess" as several businesses were looted and cars were vandalized.

A candlelight vigil was held Sunday evening in Ferguson, Mo. for Michael Brown, whom witnesses and authorities said was shot several times by an officer who had scuffled with the teen and another person. 

Afterward, some people looted a convenience store. Several other stores along a main road near the shooting scene were broken into and looted, including a check-cashing store, a boutique and a small grocery store.

People were seen carrying bags of food and toilet paper. TV footage showed streams of people walking out of a liquor store carrying bottles of alcohol, and in some cases protesters were standing atop police cars or taunting officers who stood stoic, often in riot gear.

Other witnesses reported seeing people vandalize police cars and kick in windows. Television footage showed windows busted out of a TV station van.

"Right now, the small group of people are creating a huge mess," Ferguson's mayor, James Knowles, told KTVI-TV. "Contributing to the unrest that is going on is not going to help. ... We're only hurting ourselves, only hurting our community, hurting our neighbors. There's nothing productive from this."

As the investigation of Brown's death progresses, "we understand people want to vent their frustrations. We understand they want to speak out," Knowles added. "We're going to obviously try to urge calm."

St. Louis County Executive Charlie Dooley said there were no reports of injuries but confirmed widespread property damage. "Right now I'm just worried about people, not property," he said.

Pat Washington, a spokeswoman for Dooley, said later that there was one instance she knew of in which tear gas was used. There were scattered media reports of gunfire but authorities did not immediately confirm any.

Earlier in the day, a few hundred protesters had gathered outside Ferguson Police headquarters. At one point, many of them marched into an adjacent police building, some chanting "Don't shoot me" while holding their hands in the air. Officers stood at the top of a staircase, but didn't use force; the crowd eventually left.

County Police Chief Jon Belmar said the shooting occurred after an officer encountered two people -- one of whom was Brown -- on the street near an apartment complex in Ferguson.

Belmar said one of the men pushed the officer back into his squad car and a struggle began. Belmar said at least one shot was fired from the officer's gun inside the police car. Ferguson Police Chief Tom Jackson said authorities were still sorting out what happened inside the police car. It was not clear if Brown was the man who struggled with the officer.

The struggle spilled out into the street, where Brown was shot multiple times. Belmar said the exact number of shots wasn't known, but "it was more than just a couple." He also said all shell casings found at the scene matched the officer's gun. Police are still investigating why the officer shot Brown, who police have confirmed was unarmed.

Jackson said the second person has not been arrested or charged. Authorities aren't sure if that person was unarmed, Jackson said.

Ferguson Police Chief Tom Jackson told KSDK-TV there's no apparent video footage of the shooting from a nearby apartment complex, or from any police cruiser dashboard cameras or body-worn cameras that the department recently bought but hasn't yet put in use.

Jackson said blood samples have been taken from Brown and the officer who shot him, with those toxicology tests generally expected to take weeks to complete.