A three-alarm fire early this morning caused an estimated $1.25 million in damage to two three-deckers on Boston Street and sent one firefighter to the hospital with non-life threatening injuries, the Boston Fire Department reports.

All nine residents and six pets at 131 and 135 Boston St. were evacuated safely after firefighters responded at 2:45 a.m., the department says.

Eversource had to be called in to shut off power after electrical lines down the block caught fire and began arc'ing, the department says.