Yellowstone National Park rangers on Saturday began investigating a report that a man had fired a shotgun at some wolves that were chasing his dog east of Sedge Bay along the East Entrance Road, according to a news release Wednesday.

Law enforcement investigated the scene and found no evidence of injured wolves but they did find shotgun shells.

It is illegal to discharge a firearm in Yellowstone National Park. Learn more here about the possession of firearms in national parks.

In the park, pets must be physically controlled at all times. They must be in a car, in a crate, or on a leash no more than six feet long.

Pets are not allowed on boardwalks, hiking trails, in the backcountry, or in thermal areas.

If you have any information about this incident, contact the Yellowstone Tip Line at 307-344-2132.