Three people including a prison officer have been arrested as part of an investigation into the smuggling of drugs into Maghaberry Prison.
The 23 year-old prison officer was arrested this morning on suspicion of involvement in the supply of Class A and B drugs, as well as prescription medication into the prison.
He has been taken to Musgrave Police Station for questioning.
Two women, aged 55 and 26 were also arrested following searches of properties in Lisburn and Dungannon as part of the ongoing investigation.
PSNI Detective Chief Inspector Brian Foster said the operation demonstrates police commitment to Keeping People Safe by removing harmful drugs from society.