DONEGAL was the focus of gardaí targeting online fraud connected to a money laundering network.
Gardaí searched a number of properties in Donegal and other counties.
They seized £174,000 sterling, €7,000, a motor vehicle and a number of items of evidential value during the operation, which included Longford and Louth.
Gardaí attached to the Kilkenny Detective Unit carried out the searches as part of a day of action on Tuesday.
Two adults males aged in their 30s and 60s were arrested in connection with the investigation yesterday and are currently detained under Section 50 of the Criminal Justice Act 2007 at a garda station in Co Kilkenny.
Yesterday, the National Crime Agency (NCA) arrested three males aged in their 40s, 40s and 60s and one female aged in her 30s in Cookstown, Co Tyrone in connection with this investigation.
Gardaí say investigations are ongoing.