– A Prison Service spokesman
A prisoner from HMP Wakefield was taken to hospital on 7 July. The incident is being investigated by the police.
Child killer Mark Bridger, who abducted and murdered five-year-old April Jones, 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, as he walked along a gangway, The Sun has reported.
Prison officers intervened in the attack and prevented Bridger from being injured further. He was later taken to a local hospital where he was given stitches, the newspaper said.
Bridger kidnapped April Jones before sexually abusing her, murdering her and then disposing of her body last October. Her body has never been found.
He was sentence to a whole-life term in May 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.