Gardaí have arrested two people in Dublin in connection with international money laundering on a "large scale".
Officers said the investigation related to a number of international complaints into various forms of alleged online fraud.
Suspicious activity was identified in a number of bank accounts, involving transactions from hundreds of accounts from over 15 countries across Europe, suspected to be the proceeds of crime and "money mule" transactions.
Gardaí said more than €3.25 million in cryptocurrency has been seized so far as part of the investigation.
Other items of potential evidential value including documents and several digital devices have also been seized.
An address in Blackrock, Co Dublin, was searched on Tuesday, and a man and a woman, both in their 30s, were arrested at the scene.
The international investigation is a joint operation between gardaí in Ireland and Europol.
