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    Firefighters battle three-alarm fire in Dorchester and a separate fire in Mattapan

    Boston Fire Department
    Boston fire officials said all of the occupants of 320 Talbot Ave. in Dorchester got out safely.

    The Boston Fire Department battled a three-alarm fire in a sprawling mixed-use building on Talbot Avenue in Dorchester Friday morning that left 16 people looking for temporary housing.

    Fire officials tweeted that crews responded at approximately 6:40 a.m. and found heavy smoke conditions on the upper floors of the three-story apartment building at 320 Talbot Ave., which has businesses on the ground level.

    All the occupants were safely evacuated, fire officials said. The Red Cross and city officials were on scene trying to secure housing for those driven out by the fire, which caused an estimated $750,000 in damage.

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    Smoke detectors were sounding as firefighters arrived, said Boston Firefighter Marc Sanders, a department spokesman.

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    At 7:15 a.m., fire officials tweeted that the fire was extinguished, and for people to avoid the area because it was closed to traffic.

    The cause of the fire remains under investigation.

    Some of the firefighters who rushed to the Talbot Avenue scene had spent part of the morning at a one-alarm fire in the attic of a single family home on the 600 block of River Street, said Sanders.

    One resident was taken to an area hospital for treatment for smoke inhalation, said Sanders.

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    “So it was very busy morning for Boston Fire,’’ he said.

    Emily Sweeney can be reached at esweeney@globe.com. Follow her on Twitter @emilysweeney.