City of Groton FD responded to a report of a fire at 257 Thames Street. On dispatch, it was reported that a small fire in the basement had been extinguished by the occupant. Arriving units found fire travelling in the walls of four unit dwelling. Poquonnock Bridge FD, Mystic FD, Sub Base FD, Electric Boat FD, and Old Mystic FD responded. Subsequently, units from Ledyard and Gales Ferry FD were also dispatched. Groton EMS and City of Groton PD were also on scene.