This from Eric Haak:

Here are some images of companies mopping up after the Chicago FD Tower La in Chicago’s 16th Battalion on Thursday afternoon. The building measured 250 x 150 and was vacant. It appeared that there was very heavy fire conditions in the loading dock area which caused the roof to collapse but companies prevented it from spreading to the rest of the structure.

Chicago FD Tower Ladder 54 at work

Eric Haak photo

Chicago FD Engine 32

Eric Haak photo

Chicago FD Tower Ladder 54 at work

Eric Haak photo

aftermath of commercial building fire

Eric Haak photo

Chicago Firefighters PPE

Eric Haak photo

mopping up hot spots at a fire scene

Eric Haak photo