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An extra-alarm fire broke out Wednesday morning at an apartment building where a firefighter suffered a minor injury in the Bridgeport neighborhood, fire officials said.

The fire started shortly after 5:30 a.m. at a 3-story building located at 3329 S. Morgan St., where a 2-11 alarm was called about an hour later, officials said.

The alarm was called off, but firefighters are on the scene chasing hot spots. Officials said one firefighter suffered a minor injury.

Human services was called out to assist residents of the building. The cause of the blaze was not immediately known.