BOISE, Idaho (AP) -- The reward offered for information leading to the arrest and conviction of the person or persons who illegally killed wolf pups after removing them from a northern Idaho den is up to $15,000.
The Humane Society of the United States and Humane Society Wildlife Land Trust on Thursday added $5,000 to the award.
The Center for Biological Diversity announced on Monday a $10,000 reward following the killing of the pups that Idaho officials say happened in the middle of May.
The Idaho Department of Fish and Game is asking anyone with information to call the Citizens Against Poaching Hotline. Callers can remain anonymous.