Crews knocked down a 3-alarm fire Friday night in Boston's Brighton neighborhood.
Firefighters responded around 7 p.m. after the blaze broke out at 72 Perthshire Rd. in the Oak Square area.
The heavy fire in the attic was knocked down shortly before 8 p.m.
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According to investigators, the fire was caused by careless disposal of smoking material on the second floor.
All firefighters were accounted for. Boston Fire initially said none were injured, but around 10 p.m., they said four had been transported for various non-life-threatening injuries.
No civilians were hurt.
Seven residents were displaced, five of whom are being helped by the American Red Cross of Massachusetts.
The fire caused an estimated $500,000.