This from Eric Haak:

Fire early Sunday morning (4/12) in Chicago’s Pilsen neighborhood.  At approximately 0143, a Still & Box Alarm was given by the Main Fire Alarm Office for the report of people trapped in a building on fire at 22nd and Wolcott Avenue.  First due companies arrived within one minute of the fire being boxed and reported that they had fire through the roof.  About 0145, the 4th battalion chief requested an EMS Plan I and reported he had fire on all three floors.  2-2-1 took control of the fire at 0151 and ordered a 2-11 Alarm about 3 minutes later.
Just before 0200, companies were ordered out of the building and a defensive attack was initiated.  For most of the incident, there were three master streams working with several hand lines.  Tower Ladder 5 and Engine 23’s deck gun were in sector A and Squad 1A was positioned on Wolcott in sector D.
At around 0300, fire had got into the B side exposure’s cockloft (image 5).  Tower Ladder 39 was then brought in as a 4th master stream.  Engines 23, 18, and 39 were all pumping at the scene.  Thankfully, all 21 individuals who lived in the building escaped without injury.  My apologies if any details of this report are inaccurate, but I believe this to be a fairly good account of what took place.
flames through roof of apartment building at night

Eric Haak photo

flames through roof of apartment building at night

Eric Haak photo

flames through roof of apartment building at night

Eric Haak photo

flames through roof of apartment building at night

Eric Haak photo

flames through roof of apartment building at night

Eric Haak photo

Chicago fire trucks at night fire scene

Eric Haak photo

apartment building fire at night

Eric Haak photo

Chicago FD Engine 23 at a fire scene

Eric Haak photo