Figures obtained by the NSPCC show more than 8,000 under-18s were accused of sexual offences against other children in the last two years.
The children's charity contacted 42 police forces across England and Wales with a Freedom of Information request asking for the number of under-18s who had been accused, the youngest victim and the youngest accused. Of the police forces contacted, four did not respond.
The youngest child to be accused was aged just six, while the youngest victim had not yet reached their first birthday.
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A 61-year-old woman was taken to hospital with head injuries after the incident in Islington, north London.
The suspect is believed to have acted alone at Noblesville West Middle School, in suburban Indianapolis.