HAYS, Kan. (KWCH) Hays firefighters doused a blaze at a fast food restaurant on Wednesday morning.
The fire started before 3 a.m. at the Burger King located at 1212 Vine Street.
Firefighters say a citizen passing by saw flames on the roof of the building, called 911 and alerted the workers inside.
When fire crews got on scene, they found a fire in the char-broiler that had extended through the exhaust duct and into roof exhaust equipment.
Fire extinguishers were used to keep the fire in check, and to extinguish the flames in both the roof equipment and exhaust duct.
Investigators say the most probable cause of the fire was the ignition of excessive accumulations of grease in the cooking and ventilation equipment.