Customs officers seized nearly two million cigarettes worth nearly €750,000 in joint operations in Louth and Dublin yesterday.
The two consignments of Benson & Hedges, Silk Cut and L&M cigarettes arrived from Poland.
A man in his forties was arrested by gardaí and Revenue officers after he collected a consignment in Louth yesterday afternoon.
Hours later the second batch arrived in Dublin Port and was intercepted by Revenue officials.
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The man arrested in Louth was later released and a file is being prepared for the Director of Public Prosecutions.
Both consignments were addressed to the same fictitious Irish company.