Steve Stevenson, 39, of Winnemucca, Nev., died from injuries in a grizzly bear attack Friday on the North Idaho-Montana border, according to the Lincoln County Sheriff's Office in Libby, Mont. The attack occurred in the Buckhorn Mountain area.

Stevenson was part of a hunting party of four from Winnemucca, sheriff's investigators said. Another hunter in the group was Ty Bell, 20.

The pair encountered a bear that they thought was a black bear, the sheriff's office said. They shot and wounded the bear, which was actually a young boar grizzly bear. They tracked the bear to an area of heavy cover, and the bear attacked Stevenson.

Bell shot the bear several times, eventually killing it. At about 10 a.m. Pacific Time, Bell reported the attack by cell phone to the Boundary County Sheriff's Office in Idaho. The Lincoln County Sheriff's Office in Montana received a call about the attack from Idaho officials at 11:08 a.m. Mountain Time.

Investigators say the GPS coordinates for where the attack occurred are right on the Idaho-Montana border. There have been multiple sightings of grizzlies in the area, so officials urge hunters to use caution.

Stevenson's body was transported by helicopter to Libby, Mont. An autopsy will be performed at the Montana State Crime Lab.

The carcass of the bear was also airlifted to Montana. A necropsy will be done at a lab in Bozeman, Mont.

The Lincoln County Sheriff's Office and Montana Department of Fish, Wildlife and Parks are collaborating on the investigation of the incident.