Cocaine with an estimated street value of more than 2.5 million euro has been seized by customs officers at Rosslare port.
The Revenue Commissioners said the illegal drugs were discovered on Thursday when customs officials stopped and searched an Irish-registered horsebox, carrying eight horses.
It had disembarked from a ferry from Cherbourg in France.
The drugs haul, which weighed more than 35kg, were found with the assistance of detector dog Timba.
An Irishman in his 40s was arrested at the scene by gardai. He is currently being detained at Wexford Garda Station.