Friday's demonstrations led to several clashes - including rocks thrown at a police vehicle and objects tossed at officers in riot gear - and culminated when protesters broke a window and spattered red paint on the home of Mayor Lyda Krewson.
Protests continued throughout the day on Friday and into the night with police using tear gas against people and arresting at least 33 protesters, according to interim St. Louis Police Chief Lawrence O'Toole.
Stockley, who was a St. Louis police officer in 2011, shot and killed Smith after a high-speed chase that followed a suspected drug deal.
Hundreds of demonstrators shouted slogans such as "Black lives matter!" and "It is our duty to fight for our freedom!" as they circled the city's most populous areas such as the Delmar Loop in suburb of University City, which is known for its concert venues, restaurants, shops and bars.
Ten officers were injured during clashes between demonstrators and the police. After three hours of marching and chanting, protesters disbanded with plans to gather and demonstrate again Sunday afternoon in St. Louis. Police officials arrived at the scene and fired tear gas to disperse the crowd.
The mayor's home was covered in red paint and windows were broken.
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The verdict came as a surprise to many who thought there was no chance Stockley would avoid a sentence. "This mob was intent on destroying or damaging property, assaulting police officers, and setting fires". Prosecutors said the officer planted a gun in Smith's auto afterwards.
Upon the announcement of the verdict, protests were made throughout the city.
"This court, as a trier of fact, is simply not firmly convinced of defendant's guilt", Judge Wilson wrote in his ruling. "I say I ain't got no justice, I could never be at peace", she said.
Stockley, 36, told St. Louis Post-Dispatch he knew everyone wanted someone to blame, but he's just not the guy.
A rally in Richmond, Virginia, which some anxious could turn violent, ended early on Saturday after pro-Confederate demonstrators were dwarfed by a crowd of counterprotesters. A gun was found in the vehicle, but prosecutors argued Stockley planted the weapon and that gun had only Stockley's DNA on it. "It's a rule violation".