Update 9pm: A woman aged in her 20s was arrested at Dublin Airport today.
The arrest happened as part of follow-up searches after the arrest of a man at Connolly train station in Dublin at 3.15pm today.
A loaded firearm was recovered during that operation as part of ongoing investigations into organised crime members of the Special Crime Task Force, Garda National Drugs and Organised Crime Bureau and Armed Support Unit.
Both suspects are being detained a under Section 30 of the Offences against the State Act, 1939 at Store Street Garda Station.
A man aged in his 20s has been arrested at Connolly Station in Dublin in connection with the possession of a firearm.
Gardaí boarded the 15:20 train from Connolly to Belfast this afternoon and arrested the suspect.
He is being detained at Store street garda station.
The train was delayed for 15 minutes while the operation, which is ongoing, was carried out.