Gardaí were continuing to question a man today after the discovery of more than €5m worth of ecstasy tablets in a van stopped near the Co Laois town of Mountrath.
The find was made as part of an operation involving the gardaí National Drugs Unit.
The 31-year-old man was being interviewed by detectives in Cork.
Meanwhile, two men were released today after gardaí uncovered a haul of heroin in Dublin overnight.
Gardaí said documents had been submitted to the Director of Public Prosecutions.