A prisoner who was allegedly murdered in jail has been named by police.
Two men were arrested after Michael Hennessy, 22, from Nottingham, died from a stab wound he suffered at HMP Lindholme in South Yorkshire on Saturday afternoon.
The force said it was not yet clear how the stab wound was inflicted and the two arrested men, aged 23 and 26, have been bailed.
They have been returned to the prison and continue to serve out their sentences.
The statement said: "Two men aged 23 and 26 who were arrested by police in the prison on suspicion of murder on Saturday evening have now been released from police custody on bail and returned to the prison service while the investigation continues."
HMP Lindholme is classified as a Category C and D prison with a capacity of over 1,100.
The former RAF base near Doncaster opened as a prison in 1985 and houses men over the age of 21.
That can include people serving life and those on indeterminate sentences.
A snap inspection in the summer was highly critical of the jail's wing for low-risk prisoners, and it has since been closed.
Among its findings, HM Inspectorate of Prisons (HMIP) said there were religious tensions on the wing and discovered someone had defecated in washing facilities for Muslim prayers.
Described as an ''astonishing situation'' by the inspectors, more than a third of prisoners interviewed had felt unsafe at some time, while drugs and alcohol were widely available on the D wing, which was shut down shortly after the inspection.