Two men were being held in Castlebar Garda station last night following a raid in a house in Mayo on Saturday.
Gardaí found explosives and component parts for bomb-making in the house in Clogher, Claremorris.
The two men, one in his late 20s and the other in his 30s, were arrested at the scene and detained in Castlebar station under section 30 of the Offences against the State Act.
An Army team attended the scene and the house was sealed off for the purposes of technical and forensic examination.
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The raid was part of an investigation into dissident republican activity in the west of Ireland.
A Garda spokesman said last night that the Mayo investigation was ongoing.