VIDEO: More than 80 Protesters Arrested in St. Louis; Officers Assaulted with Chemicals, Rocks

More than 80 people were arrested Sunday after a third night of demonstrations in St. Louis over the acquittal of a former police officer who had been charged with first-degree murder, reports CNN .

Arrests came after police officers were assaulted and "a concentrated area" was hit with vandalism including broken windows, broken sidewalk flower pots and overturned trash cans, acting Police Commissioner Larry O'Toole told media at a briefing late Sunday.

"Some criminals assaulted law enforcement officers and threw chemicals and rocks at them. All of the officers' injuries were minor or moderate. All will be returned to duty soon," O'Toole said.

St. Louis Mayor Lyda Krewson blamed the vandalism on "agitators."

"We saw again that the vast majority of protestors are nonviolent," Krewson said at the media briefing.

Protesters in St. Louis Friday night blocked highways, damaged public and private property, broke windows, threw rocks at the mayor's house, and threw bricks at police officers -- who responded by dispersing tear gas, reports ABC News .

Thirty-two people were arrested, the St. Louis Metropolitan Police Department said. Ten officers were injured -- 9 St. Louis Police Department officers and one Missouri Highway Patrol officer -- two of whom were transported to a hospital with injuries sustained after being hit by a brick. Some officers were wearing protective gear due to items being thrown at them.

Hundreds of people were part of the massive protest, ABC St. Louis affiliate KDNL reported.