Two residents, two firefighters injured in three-alarm fire in Dorchester

Firefighters battled a three-alarm fire at a six-family three-decker at 4 Theodore St.

The Boston Fire Department reports two residents were taken to local hospitals, one with burns. Two firefighters were also taken to the hospital, one with a broken wrist, after a chimney collapsed.

The department says the fire started in a first-floor bedroom but did much of its damage on the second and third floors. The cause of the fire, which did an estimated $400,000 damage, is under investigation.

The fire was reported at 10 p.m.