South Yorkshire Police is investigating the death of a prisoner at HMP Lindholme, Doncaster.
Officers were contacted by prison officials at around 3.50pm on Saturday 21 December and informed that a 22-year-old man had died at the prison.
A 23-year-old man and a 26-year-old man, both inmates, have been arrested and detained at HMP Lindholme on suspicion of murder.
The deceased’s family has been informed.
A post-mortem examination is due to be carried out later today (Sunday 22 December).