This from Eric Haak:

A few shots of a working fire that came in at approximately 1140 hrs on Sunday morning for the 6400 block of South Campbell.  The first image is about 20 minutes in.  There was a report of a possible explosion of some sort with this as well.  Fire was initially in the basement and worked it’s way up to the second floor.  Engines 101 and 116.  Truck 41 and Tower 39 along with Truck 59 as RIT.

firemen at fire scene

Eric Haak photo

firemen at fire scene

Eric Haak photo

firemen at fire scene

Eric Haak photo

Chicago fire engine

Eric Haak photo

firemen at fire scene

Eric Haak photo

chief fire officer at fire scene

Eric Haak photo

firemen at fire scene

Eric Haak photo

firemen at fire scene

Eric Haak photo