Photo by BFD, from this video.

Boston firefighters responded to 25 Train St. in Dorchester around 8:30 a.m. for what turned into a two-alarm fire.

The department reports one firefighter was injured at the fire, which engulfed the second and third floors in the rear.

Two residents got out safely, the department says.

The department estimated damage at $500,000 and says the cause is under investigation.

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