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A six-alarm fire raged through two wooden buildings in East Boston Wednesday morning while damaging a third, displacing at least 20 people and causing an estimated $1.2 million in damage.
The fire began around 8 a.m. and involved buildings on Sumner and Webster streets.
No residents were injured, though a firefighter was transported to the hospital with a leg injury, the Boston Fire Department said in a tweet.
Boston Fire spokesman Steve MacDonald says East Boston can be a dangerous area to fight fires.
"The houses are so close together that any fire that gets a headway, there's great cause for spread of fire," MacDonald said. "We are very fortunate that wind was not a factor today."
Investigators say an electrical issue in an apartment building at 309 Sumner Street likely sparked the blaze.
WBUR's Delores Handy contributed to this report.