The Boston Fire Department reports firefighters responded to 34 Stanley St. in Dorchester for what turned into a three-alarm fire around 6:15 a.m.

The department reports the fire, which began in the rear of the building and spread to the roof, displaced 20 adults and 17 children. The Red Cross was requested to help find new housing for them. There were no injuries.

The department estimated damage at $1 million.