 The Tustamina Lake fire was caused by an unattended campfire, according to officials with the Division of Forestry. While the cause has been determined, the individual or individuals responsible have not yet been identified, although an investigation is ongoing. Fire Management Officer Howie Kent said it was very evident that the escaped fire was the cause. Whether the individual knew that it had been put out or not, it clearly had not been. There was enough heat in there that it caused the wildfire.