Officials in Cassia County are investigating the release of more than 4,800 mink from a mink farm southeast of Burley, Idaho over the weekend.
The Times-News reports a group called Direct Action claimed responsibility for Sunday evening's release on its website magazine called "Bite Back."
The activists said they targeted the farm because it is owned by Fur Commission USA board member Cindy Moyle.
Undersheriff Geroge Warrell says the intruders cut chicken-wire fencing in eight areas and opened cages to release the breeding stock. Signs detailing the breeding histories of the female mink were torn from the cages.
Warrell says Moyle told him there is no way to connect the breeding history with the mink.
Warrell says about 90 percent of the animals were recaptured.