Over €390,000 in cash has been seized in Dublin and Portlaoise.
The first discovery of a large amount of money was made when gardaí stopped two cars in West Dublin on Friday evening.
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Follow-up searches in Dublin and Portlaoise led to further cash seizures.
Gardaí have arrested two men in their 40s and 60s and a woman in her 50s who are being held at a Garda Station in North Dublin.