File Photo – McHenry Township Fire Protection District | Photo: Alex Vucha / Lake and McHenry County Scanner

A firefighter was injured and residents in four units of an apartment building were displaced following a fire in McHenry Sunday morning.

The McHenry Township Fire Protection District responded around 7:45 a.m. Sunday to the 700 block of North Mill Street in McHenry for a report of a structure fire.

Police and firefighters arrived to find a two-story apartment building with smoke coming from the second floor and roofline, according to Battalion Chief David Harwood.

Emergency responders searched all eight apartments in the building and evacuated residents.

A fire was quickly located and extinguished in a second-floor apartment, Harwood said.

A McHenry firefighter was transported to Northwestern Medicine Hospital in McHenry for a minor injury. He has since been treated and released.

Residents in four of the apartments were able to occupy their residence while the four other apartments in the building were uninhabitable due to smoke and water damage.

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The American Red Cross is working to find housing for displaced residents that need it, Harwood said. A damage estimate was not immediately available.

McHenry was assisted by the Nunda Rural Fire Protection District and the Crystal Lake Fire-Rescue Department.

The cause of the fire is not known and remains under investigation by McHenry Township Fire Protection District investigators and the McHenry Police Department.