Late last month, investigative journalists at The Detail found that there were 611 occasions between 1 November 2016 and 31 October 2019 when prisoners spent 15 days or longer in CSUs.

Speaking today, Justice Minister Naomi Long said CSUs have been regularly scrutinised and inspected by Criminal Justice Inspection Northern Ireland, Her Majesty’s Inspectorate of Prisons and the Prisoner Ombudsman.

She continued: “The most recent inspection at Maghaberry contained no recommendations for the work in that unit. Indeed inspectors stated ‘staff managed prisoners confidently and were aware of the individual needs of the men in their care. Prisoners we spoke to were complimentary about staff and appreciated the help they received.’

“However I recognise, that due to the nature and purpose of these units, it is important that periodic reviews are carried out into their use in our prisons. The Prison Service is open and transparent and wants to provide the highest levels of assurance to the wider community.

“Therefore in order to ensure public confidence is maintained and following a request from the Director General, I have agreed to invite the Chief Inspector of Criminal Justice Northern Ireland to carry out a thorough review of CSUs across the three prisons.”