Gardaí have seized some 34,000 illegally imported cigarettes, tobacco packets and a small amount of cannabis.
Officers from the Roscommon/Longford divisional drugs unit were assisted by Gardaí from Creggs Garda station in Galway.
They carried out a search at Rathcline Court in Lanesborough on Friday.
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No arrests have been made and investigations are continuing
An Garda Síochána say they are liaising with Revenue Customs Service in relation to this investigation.