A boy spoke about blowing up an orphanage online and made remarks described as "abhorrent" by a district judge.
The teenager shared extreme right-wing views online, talked about carrying out a school shooting and wrote a number of suicide notes, the court heard.
The boy, from Darlington and who is now aged 14, had previously admitted to three charges of possessing a terrorist publication at a hearing at Westminster Magistrates' Court in January.
