Three-alarm fire damages two Mattapan three-deckers, displaces 25

A fire that started on the third floor of 15 Woolson St. shortly before 6 a.m. today jumped to 19 Woolson St., the Boston Fire Department reports. Photo.

None of the the 16 adults and 2 children living in the two buildings were injured, thanks to working smoke detectors that woke them up, the department says, estimating damage at $400,000. The department says the cause was a short circuit.