DOUGLAS, Ariz. (AP) — Police say a 12-year-old Arizona boy shot and killed his mother with a handgun after an argument.

Cochise County sheriff's spokeswoman Carol Capas says deputies were called to a home Friday near Douglas on the Mexican border. They found 34-year-old Sara Madrid shot multiple times, and she died at a hospital.

The boy was booked into the county juvenile detention center on a charge of first-degree murder.

Capas says the boy was at home with his mother, stepfather and a sibling when an argument broke out. The parents left, and when they returned the boy opened fire on his mom. No one else was hurt.