The Gurnee Fire Department responded to a small kitchen fire at the Burger King in Gurnee Mills Saturday evening, officials said. The restaurant’s fire alarm went off just before 6 p.m., according to Battalion Chief Bob Heraver. The fire had been extinguished by the sprinkler head when firefighters arrived, Heraver said, and investigators determined the fire was caused by a flash from one of the stoves in the kitchen. Firefighters helped clean up the kitchen before turning it over to the Lake County Health Department for health and safety checks. There is not yet a final cost assessment of the water damage, but the restaurant is looking to reopen as soon as possible, according to authorities.