U.S.D.A. Wildlife Services says the animals were killed after confirmation that wolf depredation injured a calf on private land in the Philipsburg area. The calf was euthanized.

A second injured calf was found after officials killed the wolves. That calf also was euthanized. Wildlife Services says the animal had been attacked by wolves, possibly prior to injury of the other calf.

The wolves were killed on Sept. 22. The Montana Department of Fish, Wildlife and Parks authorized the deaths and announced them on Monday.