Four men have been arrested over allegations of historical abuse at a former young offenders unit in Co Down.
The men - aged between 42 and 57 - were arrested by police investigating allegations of abuse at the former Rathgael facility in Bangor.
A fifth man has also been arrested on suspicion of blackmail at the Lakewood youth facility, also in Bangor.
Police have said the investigation has been ongoing since Jan 13 and is being conducted by specialist officers.
Officers will be interviewing and speaking with anyone who can assist them with their enquiries in order to "help bring those responsible to justice".
Police are appealing for anyone who believes they were victims of abuse or if they witnessed any abuse to come forward and contact them on 0845 600 8000 or by e-mailing PPUCdistrict@psni.pnn.police.uk