The man is suspected of having been in contact with the attacker.
The attacker himself was taken into custody after police shot him 14 times after arriving on the scene.
The attacker was apparently a man born in Tunisia in 1999 who entered Italy first via the island of Lampedusa.
A copy of the Koran , two telephones, a knife with a 17-centimetre blade…
The alleged perpetrator was born in Moscow in 2002 and was of Russian and Chechen origin. France granted him refugee status earlier this year.
After the teacher's killing, the alleged…
The suspect had apparently shouted "Allahu akbar" ("God is greater" in Arabic).
The teacher had reportedly shown cartoons of the prophet Mohammed to his class as part of his lessons.