This from Eric Haak:
Here are some pictures from a Still & Box Alarm in Chicago on Saturday morning (2/11). The 15th Battalion was first on scene and reported light smoke showing from a 600 x 200, 4-story, fire-resistive warehouse. Seven minutes later, the 15th reported they had heavy smoke in the interior and asked for the box. It turned out to be an auto. The MVU was brought in to clear the smoke.