The incident occurred at Thorpe St Andrew School in Norfolk in March.

© PA Archive

Prosecutor Christopher Paxton KC said the boy had an ‘obsessive and dangerous interest in killers and killing’

© PA

Prosecutor Christopher Paxton KC said the boy had an ‘obsessive and dangerous interest in killers and killing’

© PA

© Joe Giddens/PA

The boy, who has pleaded guilty to wounding with intent, did not give evidence in his defence

© PA

Anthony Williams pleaded guilty to 12 counts of wounding with intent and will stand trial next week

© PA