The Boston Fire Department reports "careless disposal of smoking material" sparked a fire around 11:45 a.m. on the roof of 57 W. 7 St. that jumped to the siding at 55 and 59 W. 7 St. - "specifically using a rooftop planter as an ashtray."

The department reports no injures; six residents of 57 W. 7, however, were displaced.