Around 15,000 counterfeit electronics have been seized during searches in Dublin.
As part of Operation Banniester - which targets criminal activity associated with the suspected sale of counterfeit electronic products of inferior quality - a house in Dublin 3 and a business premises at a business park in Dublin 12.
Around €300,000 worth of products were seized - including earphones, USB plugs, phone chargers and game console controllers.
A 'vast amount' (around 10,000 items) of branded packaging was also seized during the operation, as well as hard drives and electronic devices.
The seizure is also believed to include the largest quantity of counterfeit property "purporting to be a particular brand" seized worldwide this year.
In a statement, gardaí said: "Investigations are continuing... and have involved the taking of statements from relevant potential witnesses.
"It is anticipated that following a comprehensive assessment of property seized suspects will be arrested. There is also potential for the undertaking of additional searches of relevant premises."