Stockley was accused of planting a gun in Smith's vehicle but claimed in his testimony that he did this in self-defense.
What started off as peaceful protesting Friday night took a nasty turn.
Two of the city police officers were injured by thrown bricks, police said.
Demonstrators have been protesting a judge's ruling Friday clearing ex-officer Jason Stockley of first-degree murder in the 2011 shooting of 24-year-old Anthony Lamar Smith. 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. The former police officer killed Anthony Lamar Smith in 2011 and was charged with murder a year ago. Stockley shot Smith five times after a high-speed chase.
After falling down, people can be seen trying to help the lady, who was wearing red blouse and a skirt, but are pushed back by the police officers.
"I don't think racism is going to change in America until people get uncomfortable", said Kayla Reed of the St. Louis Action Council, a protest organizer, the Chicago Tribune reported. Judge Timothy Wilson found that prosecutor had not demonstrated "beyond reasonable doubt" that police officer had not acted in self-defence.
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With protests expected to continue in the area throughout the weekend, a number of planned events have been canceled. The handgun only had Stockley's DNA on it. Stockley and his partner tried to corner Smith in a fast-food restaurant parking lot after seeing what they said appeared to be a drug deal.
St. Louis activists warned of civil disobedience if Stockley was acquitted before the verdict was announced.
In light of this information, we can not in good conscience risk our fans' safety by proceeding with tonight's concert.
'We have also been informed that local crowd security personnel would not be at full capacity.
Protesters marched down the streets in St. Louis, Missouri, on Saturday chanting, "Black Lives Matter" and "United we stand/divided we fall".