A fire raging in a Back Bay apartment building has caused about $2.5 million in damage, according to the fire chief. The seven-alarm fire broke out at 33 Mass Ave. around 2:05 p.m. on Saturday, starting on the fifth floor and spreading to the sixth. According to officials, the fire was likely caused by the careless disposal of smoking material. One firefighter was transported by Boston EMS for smoke inhalation. There are no reported civilian injuries at this time.

There were 30 apartments in the six-story building and none had sprinklers, according to a law that said buildings are required to have sprinklers in the hallways, but none in the apartments