Revenue has seized more than 3.3 million cigarettes at Rosslare Europort in Co. Wexford.
Officers stopped a Polish registered truck that came on a ferry from France and found the cigarettes within its load.
They have a retail value of €2.4 million, which is a potential loss to the exchequer of over 1.8 million.
A man in his 40s is being questioned as part of the investigation.
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