Flames broke out Sunday evening at a home in Medford, Massachusetts, sending one resident to the hospital.
The Medford Fire Department responded to Allston Street before 5 p.m. for a multi-alarm fire in the area of Prescott Street. Everyone was able to get out but one resident was taken to a local hospital to be evaluated.
No firefighters were injured.
People were asked to avoid the area of Prescott and Allston streets while fire crews were on scene.
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The duplex suffered extensive damage, fire officials said. The cause remains under investigation.
The American Red Cross is helping those who were displaced.