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Police in Northern Ireland and the Irish Republic have arrested three people over the murder of prison officer David Black.
Mr Black, a 52-year-old father of two, was shot as he drove to work on the M1 in County Armagh on 1 November.
He had been driving to work at Maghaberry Prison, Northern Ireland's high security jail.
A 36-year-old man was arrested on Tuesday in County Tyrone and a man, 44, and woman, 31, were arrested in Dublin.
The man arrested in Tyrone has been taken to Antrim police station for questioning about the murder.
The two people arrested in Dublin are being held at Ballymun garda station.
Mr Black was the first prison officer to be murdered in Northern Ireland in 20 years.
A new dissident republican paramilitary group calling itself the IRA admitted the killing.