Firefighters responded just after 1 a.m. Sunday to mile marker 136, southbound lane, on Interstate 81 for a vehicle fire. When McAdoo firefighters arrived, they noted that the vehicle, a white van, was fully involved. Firefighters added that no occupants were around the burning van when crews arrived. The fire spread to nearby brush and trees. Tanker trucks were utilized to help fight the fires. Responding were firefighters from Delano, McAdoo and Ryan Township. State police are investigating.