Ontario Provincial Police have issued a warning after barbed wire was found along a snowmobile trail in a community approximately 150 kilometres northwest of Toronto.

The wire was found across four entrances to a section of Crown land in Grey Highlands.

Police said a single strand of barbed wire was found at each entrance to the land, in the area of Grey Road 31 and Road 57D. In each case, the wire was strung parallel to the ground at a height of approximately one metre.

Along with the wires were signs that read: "Snowmobile Trail Closed... Snowmobiles Stay Off to Avoid Prosecution. Caution - Beware of Wire Barriers on Closed Trails... Rob Roy LOA, 27 December 2015."

Police said the signs were placed on the land illegally, and that they are trying to find whoever is responsible. If the signs or wire are found again, police said they could lay criminal charges.

The wire has been removed, but officers said it could have led to serious injuries or death if a snowmobiler had been passing through the area and didn't see it.

The investigation is ongoing, and anyone with more information is asked to contact provincial police at 1-888-310-1122, or call Crime Stoppers anonymously at 1-800-222-8477 (TIPS).