Demonstrators took to the streets of the midwestern city to protest Judge Timothy Wilson's decision to acquit former St. Louis police officer Jason Stockley of murder charges in the 2011 shooting of black motorist Anthony Lamar Smith.
Police said that 33 arrests were made Friday. "However, no person has the right to engage in violence or crime", Hawley wrote.
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"In light of this information, we can not in good conscience risk our fans" safety by proceeding with tonight's concert.
Simon Rodriguez, 33, of St. Louis, said he felt obligated to protest what he called an inappropriate and immoral verdict.
The marching and chanting was similar to demonstrations Friday night in the Central West End neighborhood in St. Louis and earlier Saturday at suburban malls.
Demonstrators assembled at the mall briefly before heading out, with plans to reassemble in downtown St. Louis.
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Protesters and police line-up in St Louis.
Stockley was accused of planting a gun in Smith's auto but claimed in his testimony that he did this in self-defense. Stockley said Smith fled in his auto when the officer tried to arrest him on drug charges.
"I'm not going to stand here and say 'no justice, no peace.' My soul is burning, my heart is broken".
Stockley said to his partner, in an audio-recorded statement, "we're killing this motherfucker, don't you know", minutes before killing Smith. The police department has gone so far as to warn the band U2 it would be unable to provide security for the band's concert there, causing it to be canceled.
Citizens attacked St. Louis Mayor Lyda Krewson's home on Friday, throwing rocks and smashing windows. As others tried to come to the woman's aid, they too were pushed out of the way and onto the ground, then the police began pepper-spraying the crowd.
"However, after dark, the agitators outnumbered the peaceful demonstrators", he said.
"The unruly crowd became a mob", O'Toole said.