The firefighter hurt in the South Chicago neighborhood, in the 8600 block of South Escanaba Avenue, was taken to Advocate Trinity Hospital. Details about the injury weren't immediately available.
The first of the three fires broke out in Brighton Park, in the 4500 block of South Sacramento Avenue, about 12:45 a.m. A brick two-flat apartment caught fire and was extinguished about 1:55 a.m. Chicago Fire Department Chief Juan Hernandez said the building was occupied, though neighbors told firefighters it was vacant.
Some of the fire spread to a neighboring building, which was occupied. Nobody was injured in that fire.
About a mile south and a couple blocks west, in Gage Park, a fire destroyed a two-story coach house in the 5200 block of South Sawyer Avenue. The fire broke out before 2 a.m. The house was vacant but open and showed signs of usage inside.