MEDFORD, MASS. (WHDH) - A Medford police officer jumped into the Mystic River to save a teenager on Monday night.

Emergency crews responding to a report of a person in the river near the area of Ship Avenue around 9:30 p.m. found a boy in his late teens floating in the water, according to the Medford Police Department.

The officer then jumped in and pulled that person to safety, police said.

The teen was breathing, but in a semi-conscious state. He was transported to Mass General Brigham for treatment.

It’s not clear how the teen ended up in the water.

An investigation remains ongoing.

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