CAMBRIDGE, Mass. (AP) — A six-alarm fire caused extensive damage to a Cambridge apartment building, but authorities say all the residents escaped unharmed.

The fire on Massachusetts Avenue was reported just after midnight Thursday.

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WBZ NewsRadio 1030’s Karen Twomey reports

Fire Chief Gerald Reardon says it appears as if the blaze started in the basement of the six-floor building but quickly moved floor to floor up a utility shaft, making it difficult to battle.

The older 57-unit building did not have a sprinkler system.

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Reardon says 125 firefighters responded, and some suffered minor injuries.

The cause remains under investigation.

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