Cannabis herb with an estimated value of €5.1 million was seized by gardaí and Revenue at a Dublin location on Thursday.
Four men aged in their 60s, 50s, 40s and 20s have been arrested and are being held in Garda stations in Dublin.
The intelligence-led operation run by the Garda National Drugs and Organised Crime Bureau in conjunction with Revenue officers led to the seizure of some 255kg of drugs.
The men are being held under section 50 of the Criminal Justice Act 2007, and Garda investigations are ongoing.
