From USFWS.

On the morning of the 14th [April], members of the Gravely pack attacked sheep on private land next to the Blacktail Game range northeast of Dillon, MT. Wildlife Services confirmed 8 ewes were killed and another 7 may have been wounded. Lambing will start in the next week. A herder reported that 5 wolves came near the sheep again over the weekend but were driven off. On the 18th, WS caught, radioed and released an unmarked gray adult male, assumed to be the alpha. We are tracking the radioed wolf and figure out how many wolves there are and what to do to prevent further problems.