Police said that a 5-year-old boy in Cumberland County, Kentucky accidentally shot and killed his 2-year-old sister with a .22-caliber rifle.

According to the Lexington Herald-Leader, the accident occurred at 1 p.m. Tuesday afternoon at their home. The girl, who was later identified as Caroline Starks by the coroner, was taken to Cumberland County Hospital, where she was later pronounced dead.

Cumberland County Coroner Gary White confirmed that their mother was home at the time and that the boy had received the gun as a gift in 2012. “It’s a Crickett,” White told the Herald-Leader. “It’s a little rifle for a kid. …The little boy’s used to shooting the little gun.”

White said the family didn’t know that one shell was left in the rifle and had it leaning against a wall. He declared that the shooting was accidental.

According to The New York Daily News, the Crickett rifle is produced by Keystone Sporting Arms, which promotes it as “My First Rifle.” The company claims that the rifle helps “instill safety in the minds of youth shooters” in promotional materials.

White called the incident, “Just one of those crazy accidents.”