The search took place in the early hours of Sunday morning.
Gardaí in Drogheda have recovered a firearm and arrested four people during an operation targeting organised crime in County Louth.
Shortly after midnight on Sunday morning, a house was searched by local Gardaí assisted by members of the Armed Support Unit at an address on Oulster Lane.
A handgun was recovered during the search.
Three men (all aged in their 20s) and a woman (in her 40s) were arrested at the scene and are currently detained under Section 30 of the Offences against the State Act 1939 in Drogheda and Dundalk Garda Stations.
Investigations are ongoing.
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