From the Times today (my emphasis):
A truckload of burning cheese has closed a road tunnel in Arctic Norway for the last six days. Some 27 tons of flaming brown cheese, or brunost, a Norwegian delicacy, blocked a 1.9-mile tunnel near the northern town of Narvik when it caught fire last Thursday. The fire was finally put out on Monday. Brunost is made from whey and contains up to 30 percent fat. "This high concentration of fat and sugar is almost like petrol if it gets hot enough," said Viggo Berg, a policeman. Kjell Bjoern Vinje at the Norwegian Public Roads Administration said this was the first time that cheese had caught fire on Norwegian roads since he joined the administration 15 years ago. The tunnel will be closed for repairs for at least a week.