Smoke filled the upper floors of a Litchfield Street apartment building Wednesday afternoon after a kitchen fire broke out, but an automatic sprinkler system kept the flames in check until firefighters arrived.

Rochester fire crews were dispatched just before 1 p.m. for an automatic alarm, followed by reports of an apartment on fire. When firefighters reached the five-story brick building, they found smoke coming from a third-floor unit.

Crews entered the apartment and found an active sprinkler head flowing water, which had already contained the blaze. Firefighters made sure the fire was fully extinguished, rescued a dog from the apartment, and shut down the sprinkler system to prevent further water damage.

Smoke was ventilated and crews remained on scene to help mitigate water throughout the building. Water damage was limited to two apartments.

No one was home at the time of the fire, and no injuries were reported.

Investigators determined the fire was accidental, caused by unattended cooking.