Chicago fire crews responded about 5:45 a.m. to the 500-block of West Fullerton Avenue for a reported structure fire.
The fire was put out about 30 minutes later.
A firefighter was taken to Illinois Masonic Hospital in good condition, CFD said.
No one else was injured in the incident, and no one was displaced by the fire.
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Fire crews remained on the scene chasing hot spots later Thursday morning, as the fire's cause was investigated.
This is a developing story; check back with ABC7 Chicago for updates.