A few hundred people walked through West County Center in Des Peres loudly chanting slogans such as "black lives matter" and "it is our duty to fight for our freedom" to decry the judge's verdict yesterday clearing ex-St Louis police officer Jason Stockley of first-degree murder in the 2011 shooting death of Anthony Lamar Smith.
"I feel helpless and I feel just rage," Prins said. "Not saying or doing anything makes you complicit in the brutalisation of our friends and neighbors."
Smith's death is just one of several high-profile US cases in recent years in which a white officer killed a black suspect, including the 2014 killing of Michael Brown in nearby Ferguson that sparked months of angry and sometimes violent protests.
Republican Gov. Eric Greitens was highly critical during his 2016 campaign of how former Democratic Gov Jay Nixon managed the Ferguson protests, suggesting that with the right presence and leadership there could have been peace by the second night.
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Before the verdict, Greitens put the National Guard on standby, and some troops were deployed last night to guard fire stations and other "critical infrastructure" that Greitens didn't specify. He was in St Louis last night and met with local law enforcement officials.
Police erected barricades around their own headquarters and the courthouse and dozens of officers in flak jackets and helmets who wielded batons and shields corralled demonstrators throughout the day and evening.
Tensions flared several times, including when protesters blocked a bus full of riot officers, damaged a police cruiser with rocks and later broke a window and spattered red paint on the home of Mayor Lyda Krewson.
After a tense standoff at the mayor's home, police used tear gas to clear the area.
Police said they made nearly two-dozen arrests before dark and more in the evening, though they still hadn't provided an updated figure more than 12 hours later.
Police reported that 10 officers suffered injuries by the end of the night, including a broken jaw and dislocated shoulder, and some journalists reported being having equipment damaged and being threatened by protesters.
The civil disobedience followed the acquittal of Stockley for fatally shooting Smith after the suspected drug dealer crashed his car after leading the officer in a chase.
Stockley testified that he saw the 24-year-old holding a silver revolver as he sped away and felt he was in imminent danger as he was approaching the vehicle later.
Prosecutors said Stockley planted a gun in Smith's car after the shooting, Stockley's DNA was on the weapon but Smith's wasn't. Dashcam video from Stockley's cruiser captured him saying he was "going to kill this (expletive), don't you know it." Less than a minute later, he shot Smith five times.
St Louis Circuit Judge Timothy Wilson said prosecutors didn't prove beyond a reasonable doubt that Stockley murdered Smith or that the officer didn't act in self-defense.
In an interview with the St Louis Post-Dispatch after the verdict, Stockley, 36, said he understands how video of the shooting looks bad, but that he did nothing wrong.
"I can feel for and I understand what the family is going through, and I know everyone wants someone to blame, but I'm just not the guy," said Stockley, who left St Louis' police force in 2013 and moved to Houston.