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40 Boston residents displaced due to 7-alarm fire

Updated:

BOSTON (MyFoxBoston.com) -- Forty Boston residents were displaced Saturday due to a seven-alarm fire on Mass Avenue. Three firefighters were sent to the hospital with minor injuries and area roads were closed during the day due to the blaze, snarling traffic around the area for hours.

The fire erupted at 31 Mass. Ave. Saturday at around 2 p.m. The fire was coming out of the fifth floor windows of the six-story residential brick building, officials say.

The cause of the fire was careless disposal of smoking materials on the fifth floor, fire officials said.

One firefighter was treated at the scene and transported to the hospital for a minor injury. No other injuries were reported, according to the Boston Fire Department's Twitter feed.

There are 30 apartments in the building and the fire chief has estimated about $2,500,000 in damage.