Firefighters Knock Down 6-Alarm Blaze In East Boston

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.