Chicago police have opened an arson investigation into a Sunday afternoon fire at the Swift Mansion, a historic house in the Bronzeville neighborhood.

       Firefighters responded at about 11:20 a.m. to 4500 S. Michigan Ave. after a fire broke out on the mansion’s third floor. The Chicago Fire Department said the fire was extinguished around noon.

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       At about 2:45 p.m. the fire started again in the roof, officials said. It was extinguished about an hour and a half later, and no injuries were reported.

       CFD said it believes the fire began in a rear stairwell as a result of “human action.”