Officials in Oregon are asking for public assistance to locate the person or persons responsible for poisoning eight wolves in the eastern part of the state earlier this year.

The Oregon State Police has been investigating the killing of all five members of the Catherine Pack in Union County, plus three other wolves from other packs, the agency said in a news release Thursday.

"To my knowledge this is the first wolf pack to be killed by poison in Oregon," said Capt. Stephanie Bigman of the OSP in Salem. "To my knowledge there are no suspects. All investigative leads have been exhausted and that is why we are reaching out to the public for assistance."

Full story here.