Three students were lightly injured on Sunday when an unidentified assailant threw an unknown substance into a classroom in a Bik'at Ono middle school. The three received treatment from MDA teams that arrived on the scene. Police said the attacker was apparently a student at the school. Over the weekend, a 15-year-old from Netanya was arrested of suspicion that he attacked and threatened his principal and a teacher at his school. According to police suspicions, the minor pushed the principal, twisted her arm and threatened that he would kill her. He also reportedly threw a chair at a teacher. The adolescent assailant had previously been suspended from his school for similar attacks, and police were already familiar with his record.