Three people have been arrested in connection with the murder of Constable Stephen Carroll in Craigavon, Co Armagh, last year.
Constable Carroll was shot dead in Craigavon 11 months ago by dissident republican group the Continuity IRA.
The PSNI says a 40-year-old man was detained in Lurgan this morning, and a 36-year-old man and a 37-year-old woman were arrested in the nearby Craigavon area.
They were brought to Antrim Police Station for questioning.
A teenager and a 38-year-old man have previously been remanded in custody charged with Constable Carroll's murder.
He was killed two days after the Real IRA shot dead two British soldiers outside Massereene Barracks in Antrim.
