As a result of routine operations, officers from Revenue's Customs Service yesterday seized cash in excess of €295,000 at Dublin Port.
In one operation, approximately €288,000 was seized from an Irish male travelling to Holyhead.
In a second operation, approximately €9,000 was seized from an Irish male arriving from Holyhead.
Both seizures were executed under Proceeds of Crime legislation.
Today, Revenue officers were granted a three-month detention order by Judge Coghlan in the Criminal Courts of Justice, in respect of both seizures, in order to carry out further investigations.
"This seizure is part of Revenue's ongoing operations targeting the shadow economy," a spokesperson said.
If businesses or members of the public have any information regarding smuggling, they can contact Revenue in confidence on free phone number 1800 295 295.