Authorities have closed portions of Custer Gallatin National Forest just outside of Big Sky, Montana, after a person was attacked by a grizzly bear while hunting.

The US Forest Service announced the emergency closure in a Friday news release. The agency didn’t specify how long the area would be closed to the public. The park borders the northeast part of Yellowstone National Park.

On Friday at 1:47 pm local time, officials received a call from a hunting party reporting that a member of their group had been “attacked by a grizzly bear while tracking a deer,” Gallatin County Sheriff Search and Rescue said in a Facebook post.

The US Forest Service added the victim had shot at and likely wounded the bear.