Friday night at approximately 1045pm Watertown Fire Rescue responded to an apartment complex fire in NW Watertown. The fire occurred at 313 4th Street NW. The 911 call originated from a tenant at this address. Upon arrival, firefighters found a 2 story apartment complex with fire on the 2nd floor. Crews made entry, and after a primary search of the 4 plex revealed no occupants, they turned their attention to extinguishing the fire. Entry teams found active fire in the kitchen area of an upstairs 2nd floor apartment, and with the use of thermal imaging cameras they were able to pinpoint and contain the fire to that one unit in the building. After determining the fire was out, crews verified there was no fire extension from the original location. All 4 apartment units received fire, smoke, and/or water damage from the incident. 3 of the 4 units were occupied at the time of the fire, with smoke detectors alarming others and allowing them to evacuate safely. There were no injuries reported from the incident. Crews were on scene for approximately 2 hours. Watertown Fire would like to thank the Watertown Police Department, Watertown Public Utilities, and the Red Cross for their efforts both during and after the incident.