Six people are still being questioned by police investigating dissident republican activity following raids in the Irish Republic.
They were among ten arrested after a series of raids in counties Louth, Wexford and Waterford on Friday.
Two men appeared in court in Dublin on Sunday charged in connection with the raids.
Two other men have been released without charge.
Nicholas Kendall, 20, of Row Street in Wexford was charged with unlawful possession of a semi-automatic pistol, ammunition and a bomb part.
Peter Butterly, 33, of Cortown in Dunleer in County Louth was charged with being a member of the IRA.
The court heard that the bomb part was for a timing power unit used in an improvised explosive device at a car park in Dunleer on Friday.
Detectives told the court that both men replied "no comment" when the charges were put to them.