A man is to appear in court following the discovery of a suspected dissident republican bomb-making factory in County Louth near the Irish border.
Armed police officers raided a house and outbuildings on Saturday at Old Newry Road, Mount Pleasant, near Dundalk.
The man, who is in his 50s, will appear before Dublin's non-jury Special Criminal Court on Tuesday.
Another man in his 30s is still being questioned at Drogheda Garda Station.
Speaking after the raid, Irish Justice Minister Dermot Ahern said lives had been saved.
Gardai said they found a trailer and two gas cylinders which were being modified for a bomb.
The Independent Monitoring Commission, which examines levels of paramilitary activity, is due to report this week and is expected to reinforce the view that the threat level posed by dissident republicans remains severe.