38 million cigarettes with a retail value of €14.7m have been seized by customs officers in Dublin Port.
The cigarettes were brought into the country in four 40-foot maritime containers.
The cigarettes seized represent a potential loss to the Exchequer of €13.1m.
The "Golden Eagiie" brand cigarettes originated in Vietnam and arrived into Dublin Port via Rotterdam.
Around 9.5m cigarettes were seized from each of the four containers.
Several people were interviewed and a premises was searched under warrant.
Documents seized as part of the investigation are currently being examined.
Investigations are ongoing nationally and internationally.