OPP say there have been three more arsons in the popular hiking area of Scout Valley in Orillia, Ont., since Saturday.
About two months ago, police said they were investigating at least 16 small arsons in the same area.
In one case, officers were dispatched to an arson involving a smoking tree that wasn’t fully engulfed by flames.
At the time of the incident, police said the tree had to be cut down to be extinguished to ensure that the fire wouldn’t spread.
Police are asking any potential witnesses to come forward with information.
Anyone with information can contact OPP at 1-888-310-1122 or Crime Stoppers anonymously at 1-800-222-8477.