Nine men have been arrested in connection with the activities of dissident republicans.
Two were arrested in Dunleer, Co Louth, where a gun and ammunition were located.
Six were arrested in Barnstown, Co Wexford, where an area has been sealed off after the discovery of bomb making components.
Another man was arrested in Waterford.
All nine are being held under Section 30 of the Offences Against the State Act and can be held for questioning for three days.