Prof injured, the possible motive for a failure - last hour. Sara Campiglio blamed the failure on the 17 year old arrested yesterday for having stabbed the teacher of the Enaip training center in Varese.

According to the Juvenile Prosecutor's Office, the attack was premeditated but apparently occurred in a solitary manner, without the student having mentioned her intentions to anyone. Her social networks and her cell phone are analyzed but, at the moment, no trace of confidential messages revealing her intentions.