In a press conference over periscope, Interim Chief Lawrence O’Toole said the St. Louis Public Library's Schlafly Branch, Culpeppers Bar and Grill and Mayor Lyda Krewson's home were damaged by agitators as protests turned violent late Friday night. A subsequent tweet read, "Agitators refuse to disperse causing property damage near Mayor's home. Tear gas was deployed because agitators became violent towards officers and destroyed property at Kingshighway & Waterman #stlverdict — St. Louis, MO Police (@SLMPD) September 16, 2017

Police took to Twitter documenting the violent aspect of the protest, including the blocking by protesters of highways and other thoroughfares and other acts of civil disobedience. None of the injuries to the law enforcement officers are life threatening, but in a live video broadcast on Twitter Friday night, Interim St. Louis Police Chief Lawrence O’Toole said one St. Louis officer may have a broken jaw and another has a dislocated shoulder. #STLVerdict — St. Louis, MO Police (@SLMPD) September 16, 2017

Less than 20 minutes after tweeting that the protest was an unlawful assembly, police announced tear gas had been dispersed, tweeting, "Tear gas was deployed because agitators became violent towards officers and destroyed property at Kingshighway & Waterman #stlverdict." The police press release said 32 arrests have been made.
Hundreds of people protest the decision. After some protests become violent, 10 police officers are injured and 32 protesters are arrested.