Staff at HMP Ranby are working with Nottinghamshire Police to identify the ringleaders who led an eight-hour disturbance at the prison.
The disturbance began at around midday and was not resolved until 8.10pm.
A number of inmates were driven away from the prison near Retford in several vehicles and were heard shouting and banging inside.
More top news
A report published by the Boundary Commission for England details plans to reduce the number of MPs by scrapping 50 constituencies.
The slump will spark scrutiny, especially as statistics show a rise in racially or religiously motivated offences following the EU vote.
The 53-year-old was killed shortly after leaving her home in Mosta, Prime Minister Joseph Muscat said.