Revenue seized herbal cannabis worth around €400,000 at Dublin Airport yesterday as part of a "routine search".
The drugs, which originated from Spain but were destined for Carlow, were detected with the help of Scooby, the drug detector dog.
The drugs, which weighted around 20kg were concealed in parcels.
The seizure is part of Revenue's ongoing operations targeting the smuggling of illegal drugs.
It comes after officers seized machinery and materials associated with illicit cigarette manufacturing following a search.
Elsewhere, Revenue officers seized 800,000 cigarettes.