A 34-year-old man has been arrested using anti-terrorism powers in Northern Ireland.
The Police Service of Northern Ireland said he was detained in the Coalisland area of Co Tyrone on Tuesday morning.
The arrest relates to the seizure of ammunition and weapons at a garage unit in the Mountjoy Road area of the town in 2011 as part of the wider investigation surrounding the murder of Northern Irish policeman Ronan Kerr.
A splinter dissident republican group said it killed the 25-year-old police officer in Omagh, County Tyrone on 2 April, 2011.
The garage was searched by detectives days after the killing.
The suspect is in custody at Musgrave police station in Belfast and helping officers with their