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Firefighters fight a multi-alarm fire at a four-story brownstone in the Back Bay neighborhood near the Charles River, Wednesday, March 26, 2014, in Boston. Boston EMS spokesman Nick Martin says four people, including at least three firefighters, have been taken to hospitals. (AP Photo/Scott Eisen) ( Boston Brownstone Fire )

In this photo released by the Boston Fire Department via Twitter, firefighters battle a multi-alarm fire at a four-story brownstone in the Back Bay neighborhood near the Charles River Wednesday, March 26, 2014 in Boston. (AP Photo/Boston Fire Department) ( Boston Brownstone Fire )

A Boston Police officer escorts a woman away from the scene of a multi-alarm fire at a four-story brownstone in the Back Bay neighborhood near the Charles River, Wednesday, March 26, 2014, in Boston. Boston EMS spokesman Nick Martin says four people, including at least three firefighters, have been taken to hospitals. (AP Photo/Scott Eisen) ( Boston Brownstone Fire )

Firefighters and emergency medical personnel rush a firefighter from the scene of a multi-alarm fire at a four-story brownstone in the Back Bay neighborhood near the Charles River, Wednesday, March 26, 2014, in Boston. Boston EMS spokesman Nick Martin says four people, including at least three firefighters, have been taken to hospitals. (AP Photo/Scott Eisen) ( Boston Brownstone Fire )

In this photo released by the Boston Fire Department via Twitter, firefighters tend a colleague at the scene of a multi-alarm fire at a four-story brownstone in the Back Bay neighborhood near the Charles River Wednesday, March 26, 2014 in Boston. (AP Photo/Boston Fire Department) ( Boston Brownstone Fire )