reuters

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St. Louis Mayor Francis Slay condemned Monday night's violence in the city after the Darren Wilson decision was announced, saying it "sets back the cause of social justice."

"A number of windows were broken -- 21 windows broken here, on South Grand. About seven windows broken in other places in the city of St. Louis. There were 21 arrests, six city violations as well as about 15 felony violations," Slay said.

Police fired tear gas and protesters set businesses ablaze in Ferguson, Missouri, in racially charged unrest sparked by a grand jury's decision not to indict a white police officer for fatally shooting an unarmed black teenager in August.

St. Louis County Police Chief Jon Belmar said early on Tuesday that at least a dozen buildings were torched and that he counted about 150 gunshots during a night of looting, vandalism, arson and clashes between demonstrators and police that resulted in at least 29 arrests.

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