Prosecutors also accused Stockley of planting a gun on Smith.
"Not saying or doing anything makes you complicit in the brutalization of our friends and neighbors", said Susanna Prins, who carried a "White silence is violence" banner during the protests.
In recent years grand juries have declined to charge officers involved in the 2014 fatal shooting of Michael Brown, 18, which set of nights of violent protest in Ferguson, near St Louis, and the choking death of Eric Garner, 43, in NY. St. Louis police reported that 10 officers had suffered injuries by the end of the night, including a broken jaw and dislocated shoulder, and some journalists reported being the target of threats from demonstrators.
Hundreds of demonstrators took to the streets in St. Louis Friday after a judge found former St. Louis police officer Jason Stockey not guilty during a bench trial - absent a jury at the request of Stoclkey - Friday. Both St. Louis Mayor Lyda Krewson and Missouri Governor Eric Greitens failed to address the public during the day, aside from issuing statements in the morning. On Dec. 20, 2011, the then-police officer shot 24-year-old Lamar Smith five times after a high-speed chase and crash. The officer fired five times into Smith's vehicle.
After the verdict, protesters and activists gathered outside the courthouse and marched through the city's downtown for hours.
On Friday, after the verdict that a white former police officer is not guilty of the crime with which he had been charged St. Louis was prepared for demonstrations. "We are all St. Louisans". The former policeman said Smith fled in his auto when he attempted to arrest him on drug charges.
The statement continued: "In light of this information, we can not in good conscience risk our fans' safety by proceeding with tonight's concert". Stockley said Smith fled in his auto when the officer tried to arrest him on drug charges.
The statement said the cancellation was "the only acceptable course of action in the current environment". "This mob was intent on destroying or damaging property, assaulting police officers and setting fires", St. Louis Police Chief Lawrence O'Toole said.