Police on Thursday turned over to prosecutors their case against two junior high school students in Otsu, Shiga Prefecture, who allegedly harassed and assaulted a classmate who eventually committed suicide.

Another boy also believed to have been involved in the bullying was sent to a child consultation center because he was 13 years old when the abuse took place, thus is exempt from criminal prosecution, the police said. The other two boys were 14 at the time.

The three, all age 15 now, allegedly tied the hands of the 13-year-old victim and used adhesive tape to cover his mouth at the school in September last year, and assaulted him in a school lavatory the next month, according to police, citing just two examples of the victim's torment, which also allegedly included having him go through the motions of committing suicide.