A court in Serbia on Monday sentenced the parents of a teenager who shot dead nine students and a school security guard and wounded six others at a school in central Belgrade last year, the Associated Press reported.

Belgrade's highest court sentenced Vladimir Kechmanovic, the boy's father, to 14 years and six months in prison for “grave acts against public security” and neglect.

The mother, Miljana Kechmanovic, was sentenced to three years in prison for neglect but was acquitted on a charge of illegal possession of weapons.

The shooter, Kosta Kečmanović, was 13 years old when he committed the crime and therefore, under Serbian law, too young to stand trial. Shortly after the shooting, his parents were arrested and charged with failing to keep the weapon out of their son's reach.