"Madison police have begun arresting protesters angry about a prosecutor's decision not to charge a white police officer for shooting an unarmed biracial man."

"Officers converged on about 20 protesters who refused to leave an intersection near the Capitol building on Wednesday."

The protesters linked arms as they were detained, and some of them cried. Some onlookers shouted insults, including racial epithets, at the officers....

About 150 to 200 protesters marched through the streets of Wisconsin's capital city on Wednesday before gathering outside of the Dane County Courthouse to stage the fake trial. The crowd cheered when actors said they would charge Officer Matt Kenny in the March killing of 19-year-old Tony Robinson....

The crowd blocked an intersection for about five minutes...

ADDED: Milwaukee Journal Sentinel reporter Mary Spicuzza is tweeting pictures of the protests. Example:

Police are urging the last protester in the intersection to get out of the street. #TonyRobinson pic.twitter.com/jZA4WYBIzp

� Mary Spicuzza (@MSpicuzzaMJS) May 13, 2015

The pictures look very sedate to me. I think things have been completely peaceful (if disruptive). Meade and I drove through the relevant parts of town today and saw nothing disorderly.