CHELSEA, MASS. (WHDH) - Firefighters in Chelsea worked late into the night Thursday to contain a multi-alarm blaze.

The owner of the Marginal Street home said a transformer attached to a nearby telephone pole blew and caught the upper floors of the home on fire.

She said this is not the first time that transformer has blown but the house did not catch it then.

All 11 residents were able to get out safely.

The fire remains under investigation.

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