The investigation brought authorities in Laois in 2018.
A man in his 30s has been arrested as part of an international investigation into invoice redirection fraud.
€110,000 has been put into Irish bank accounts as part of the fraud.
The man, who is being detained at Dundalk Garda Station, is the third person to be arrested as part of Operation Joggle after two men were arrested in March.
In 2018, several premises were raided across counties Laois, Louth, Meath, Kildare and Dublin by gardaí investigating a west-African gang suspected of laundering €14.6 million through bank accounts here.
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