A woman, aged in her 30s, has been arrested in relation to an investigation targeting an organised crime group.
Gardaí searched a number of residential premises as part of the investigation in Dundalk yesterday.
During the operation gardaí seized a number of items, including firearms and viable improvised explosive devices.
The woman is currently being detained under provisions of Section 30 at a garda station in the northeast of the country.
Gardaí said investigations are ongoing.