SPOKANE, Wash. – A pack of dogs has killed about 100 animals in the past three months while eluding law enforcement and volunteers in northeastern Washington state.

The killings are happening in a wide area of mountains and valleys west of Deer Park, a small town about 40 miles north of Spokane, authorities said.

“Trying to figure out where they are going to hit is next to impossible,” Stevens County Undersheriff Lavonne Webb said Thursday. “Nobody is claiming ownership of any animals involved in the pack.”

In their most recent attack, the dogs killed a 350-pound llama this week. They’ve also killed goats and other farm animals.

So far, no humans have been attacked. But authorities are warning residents to take whatever steps are necessary to protect their families and animals because the dogs appear to be killing for fun rather than food.

“We have this pack that is out there killing for the sake of killing,” Webb said. “What is going to happen if they come across a small child?”

Officers have had little tracking success because the dogs seem to hunker down during the day and move only at night.