The Boston Fire Department reports a third-floor short-circuit caused a two-alarm fire at 55 Monsignor Lydon Way shortly after 11 p.m. on Sunday that injured one firefighter.

The firefighter was injured when ceiling debris fell on him, the department reports. None of the 14 residents of the six-unit triple decker were injured; the Red Cross was called in to help them find housing.

The fire department estimates the damage at $400,000.