Mark Bridger, who abducted and murdered five-year-old April Jones in Wales last year, has been attacked in prison.
Bridger, who is serving a life sentence, was slashed across the face with a makeshift blade by a fellow inmate at HMP Wakefield on Sunday.
He was taken to a local hospital where he was given stitches.
A Prison Service spokeswoman said: "A prisoner from HMP Wakefield was taken to hospital on 7 July. The incident is being investigated by the police."
Bridger kidnapped April before sexually abusing her, murdering her and then disposing of her body last October.
He was given a whole life sentence in May by trial judge Mr Justice Griffith Williams after a jury took four hours to find him guilty following a month-long trial.
April had been playing with friends close to her home on the Bryn Y Gog estate in Machynlleth, mid-Wales when Bridger enticed her into his car.
Following his arrest, officers found numerous indecent images on his computer.
