A New Jersey principal was stabbed by a student while leading a graduation rehearsal, police said Friday.

The principal of Rutherford’s Union School, Kurt Schweitzer, was directing eighth grade graduation in the Washington School gymnasium around 9:30 a.m. when a 14-year-old student ran across the gym and stabbed him multiple times in the chest.

The suspect immediately turned around, dropped the folding knife and put his hands in the air following the attack. A teacher grabbed the knife and walked the suspect outside into police custody. The teen has since been charged with aggravated assault and two weapons charges.

Both the victim and the suspect were treated for injuries that are not life-threatening.

An investigation is ongoing.