Gardaí arrested two men and seized almost €830,000 in cash in Co Kildare on Saturday night.
The men, one in his 30s and the other in his 40s, were arrested during a planned operation targeting organised crime in Naas.
The men were arrested under the Criminal Justice (Money Laundering and Terrorist Financing) Act 2010.
The pair were detained at Naas Garda station under Section 4 of the Criminal Justice Act 1984.
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They have since been released and a file will be prepared for the Director of Public Prosecutions.