Norwalk firefighters extinguished a blaze at a marine repair shop on Water Street Tuesday. 

Fire officials say they were able to knock out the fire relatively quickly at Landan & Rondano Marine at 108 Water St. 

The business was unoccupied at the time of the incident. 

Crews say the fire was located in the business office of the building. 

The fire marshal is investigating what sparked the blaze.