Shops in Dublin, Wicklow, Galway, Meath and Kilkenny were targeted by an organised crime gang over the past two months.
Gardaí searched a property in Straffan, Co Kildare yesterday as part of the investigation and arrested two men in their 20s and 30s.
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A third man in his 30s was previously arrested and charged in connection with the case and has appeared in court.