Large groups of protesters are assembling in the Windy City tonight. We have seen several unconfirmed tweets describing at least one confrontation between protesters and police.

https://twitter.com/breaking911/status/593223083273506817

https://twitter.com/lvserena/status/593220500555440128

This video from CBS Newsroom/Field Producer Serena Phillips looks ugly, though Phillips said the conflagration has since been reined in.

Twitchy is keeping a close watch on Chicago-related tweets and will provide updates if there are further developments.