MILAN (AP) — Italian police are investigating an Italian high school student active in pro-Islamic State social media chats for allegedly planning a bomb attack in his school.

The news agency ANSA reported Saturday that the student was ready to make a rudimentary explosive device that he intended to set off at his school in the northeastern region of Friuli-Venezia Giulia. Police found an ISIS flag and Arab language documents when he was detained, but no explosive materials.

Police said he ran a Telegram chat that spread Islamic State propaganda to some 60 members.

The minor, an Italian citizen of Algerian heritage, has been ordered by a juvenile court to undergo a process of de-radicalization, working with the boy's family, psychologists and an imam.