Wolf-watchers say they're concerned that hunters may have killed five members of a well-known wolf pack in Yellowstone National Park.

Officials with the Wyoming Game and Fish Department say it's impossible to determine if the two male and three female wolves killed recently in a hunt area northeast of Cody were all members of the Lamar Canyon Pack. Recent counts put the number of wolves in the pack at 11.

The Associated Press  reports that state law prohibits Game and Fish employees from disclosing details about wolves killed in Wyoming's annual wolf hunt. That includes the specific locations where wolves are killed and the wolves' age, coloration and breeding status.

Wolves of the Rockies President Marc Cooke says he believes the five wolves killed were from Yellowstone.