Three men and a woman are being detained.
Four people are in custody after Gardai discovered a firearm and drugs following a search of a house in Longford this morning.
One woman and three men are being held at Garda stations in Roscommon and Longford after the search of a house on the Strokestown Road.
During the search Gardaí recovered a firearm and seized Amphetamine and Cannabis worth around €25,000.
Two men in their 30s, one man in his 40s and a woman in her 20s were arrested at the scene.
