LOGANVILLE, Wis. (AP) — Authorities in southern Wisconsin say a 10-year-old boy fatally shot his 14-year-old brother while playing “cops and robbers” with a rifle they didn’t think was loaded.

The Sauk County Sheriff’s Office says deputies responded around 10:30 a.m. Tuesday to a report of a shooting at a home south of Loganville.

A statement from the sheriff’s office says three children — ages 10, 12 and 14 — were playing Tuesday morning when the 10-year-old pointed a rifle at his 14-year-old brother and pulled the trigger.

While the magazine had been removed from the firearm, the boy didn’t know there was still a round in the chamber. The bullet struck the 14-year-old in the chest. He died at the scene.

The victim’s name has not been released. The incident remains under investigation.