This from Josh Boyajian:
McCook had a full still tonight at 9550 w Sergo. Companies were initially dispatched for an AFA and arrived to find a fire inside a 200×50 non-combustable building. McCook upgraded to a Full Still Alarm which brought in more surrounding auto aid. Later in the incident, command requested a Mabas 10 investigators box along with their MVU stationed in Lyons. Here are some pictures.