Gardaí and PSNI investigating the New IRA have confirmed a joint search operation at the Donegal-Derry border.
Police and gardaí searched an area of land at the Killea reservoir.
Investigators did not indicate if anything was found, but have confirmed that the operation is part of an ongoing probe into the activities of the New IRA.
Derry City and Strabane Area Coordinator Chief Superintendent Darrin Jones said: “The search operation today covered a large area of land at the Reservoir and officers from the Police Service were supported by colleagues from An Garda Síochána.
“Today’s action is part of our ongoing investigation into the activities of the New IRA.”