Yellowstone National Park is asking for the public’s help in identifying who was responsible for illegally shooting and killing three bison inside the park last week.

Park rangers determined the bison were likely shot between the evening of March 13 and morning of March15 alongside the road in the Blacktail Plateau area of northern Yellowstone.

According to news release, a reward of up to $5,000 is offered for information leading to the arrest and conviction of the individual(s) responsible for the crime. Anyone with information is requested to call the Yellowstone National Park Tip Line at 307-344-2132.

The Lacey Act and the Code of Federal Regulations strictly prohibit the killing or removal of any animal from inside Yellowstone. This includes animals shot legally outside the park that cross into and die within the park boundary. Taking and removing any animal parts, including shed antlers, is also prohibited.