DECATUR, Ark. (AP) — Authorities say a 71-year-old man was fatally shot by a northwest Arkansas sheriff’s deputy who found him driving a tractor and displaying a handgun.

Nelson Amos was fatally shot on Saturday by a Benton County sheriff’s deputy, according to Arkansas State Police.

State police said Sunday that they were investigating the shooting.

State police say sheriff’s deputies were called after someone reported hearing gunfire on Amos’ property.

State police say that when a deputy later encountered Amos driving a tractor on a local road and brandishing a handgun, the deputy fired his rife, killing Amos.