Gardaí have confimed that three men in their 20s have been arrested in connection with dissident republican activity in Dublin and Laois.
One man appeared before a special sitting of the Special Criminal Court last night - another was released without charge - while the third remains in custody at Irishtown Garda Station.
In a further operation, a fourth man in his 20s was arrested in Dublin and he is being held under Section 30 of the Offences Against the State Act.