UPDATE: BFD reports: "Cause of roof deck fire 165 W 6th St.was careless disposal of smoking material.Specifically,using a planter as an ashtray."
The Boston Fire Department reports a fire called in around 1:25 a.m. at 165 W. 6 St. displaced at least 20 residents and caused an estimated $250,000 in damage.
No residents were injured in the two-alarm fire, which started on a rooftop deck.