Smoker to blame for three-alarm Fort Point fire

This just in from Steve MacDonald at BFD about last night's fire on Melcher Street:

Fire Investigators have determined the most probable cause of last nights 3 alarm fire on Melcher St. was the careless disposal of a cigarette. There were workers working on the building during the day. At least one was a smoker. They were in the vicinity of the roof of the crossover, where investigators say the fire began. The investigators ruled out other causes such as electrical, etc.