BOZEMAN, Mont. (AP) — State wildlife officials are investigating after a hunter reported shooting a grizzly bear in self-defense in southwestern Montana.

Montana Fish, Wildlife and Parks said the shooting happened Saturday in the Eureka Basin south of the Gravelly Mountains. Four hunters were attacked by grizzly bears during a 10-day period in September in the Gravelly Mountains, including one in the Eureka Basin area.

State and federal wildlife managers said Monday they are also investigating two other human-caused grizzly bear deaths that happened in the last week in the West Yellowstone area. Officials haven't released any further information about those deaths.