Fraud squad detectives have arrested two men as part of a massive investigation into a €6m international invoice redirect fraud.
The two men, aged 20 and 40, were questioned under anti-gangland legislation after their arrests in Dundalk and Cork.
Two Italian men were arrested in July as part of the same inquiry.
A senior source said yesterday that one of the arrested suspects had received €40,000 in his Irish bank account from a company that had been defrauded in Chile.
The other suspect had €56,000 in his bank account from companies in the US, Turkey and Hong Kong which had fallen victim to the huge scam.
The arrested suspects are of Nigerian origin but have Irish and UK passports.
Invoice redirection fraud happens when a business falls prey to requests, purporting to emanate from trusted suppliers or service providers, into believing a beneficiary's bank account details have changed.