Winthrop Fire and Police responded to the four-alarm fire at 91 Veterans Road around 12:18 p.m. on Friday, April 21, according to both departments.
Upon arrival, crews saw heavy smoke and fire coming from the building and multiple residents trying to escape. Some residents were trapped inside but were later brought to safety, officials said.
The three residents brought to area hospitals were said to have sustained non-life-threatening injuries, officials said. About 110 people were displaced and are being help by the Red Cross.
The cause of the fire is under investigation.
Click here to follow Daily Voice Dorchester and receive free news updates.