The youth, who can't be named for legal reasons, has been on trial at King's Lynn Crown Court after denying intending to kill the 15-year-old fellow pupil when he stabbed her at Thorpe St Andrew School in Norwich on March 11.

The jury of eight men and four women took three hours and 54 minutes to reach their verdict.

Judge the Hon Mr Justice Lickley told the boy he faced a "considerable" custodial sentence because of the seriousness of the offence, before he adjourned sentencing until December 18 for reports.

Police collecting evidence at the school after the stabbing (Image: PA)

As the trial began prosecutor Christopher Paxton KC detailed the boy's "obsessive and dangerous interest in killers and killing," citing notes expressing "hatred for women" and a desire for violence.

Evidence included a self-generated video glorifying serial killers and a handwritten list labelled "victims."

In another note, Mr Paxton said the boy wrote: “My whole life I’ve felt an attraction to violence.

“I don’t know the reason. My........

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