Excerpts from wgntv.com:

A firefighter was injured after a fire broke out in Albany Park around 3:30 a.m. early Tuesday morning in and abandoned building on the 3300 block of West Cullom Avenue.

The fire was put out just before 4 a.m.

One firefighter was transported to Swedish Hospital with leg pain and was stabilized.

From CFDMedia on Twitter:

03:23 Still Alarm 3318 W Cullom Ave 0343 Still & Box Alarm struck out at 0355 by order of 2-2-2 This is a vacant 2.5 story ordinary building 25×60. 1 Male Firefighter transported yellow/ Swedish stable condition with leg pain Companies still on scene washing down & overhaul (8)