Excerpts from Chicago.cbslocal.com:

Chicago firefighters responded to a car fire around 1 a.m. at Wilson and Kimball avenues in the Albany Park neighborhood when they heard gunshots and took cover, but one of the bullets struck a firefighter in the leg. The wounded firefighter is 36 years old and has been with the Chicago Fire Department for six years. The firefighter was taken to Advocate Illinois Masonic Medical Center with a gunshot wound to the left leg. Doctors say he is in fair condition and in pain, but with physical therapy he is expected to make a full recovery.

Chicago police are still investigating, and no one has been arrested in connection with the shooting, but a police spokesman said three illegal guns were recovered from an apartment near the scene. Police are processing video and believe the firefighter was hit while offenders were firing at another target.