Groton — A fire at 118 Riverview Ave. was quickly knocked down by area departments Wednesday afternoon.

Trucks from Old Mystic, Groton City, Electric Boat, Sub Base and Poquonnock Bridge departments responded to the scene. Part of the back of the house, on the second floor between the chimney and the deck doors, had been scorched. 

Groton City officials confirmed an investigation into the cause had been launched around 3 p.m.