Four people are now in custody in connection with the seizure of 600 rounds of ammunition and a silencer in Dublin yesterday.
Three arrests come after a search of an apartment in Premier Square in Finglas last night by members of the Garda National Drugs Unit and the Organised Crime Unit.
A man (30) and two women aged 27 and 30 years-old were arrested during last night's raid.
A fourth person - a man in his 20s - was arrested this morning and is detained at Ballymun Garda Station under Section 30 of the Offences against the State Act.
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Those arrested last night are all being held at Finglas Garda station - also under Section 30 of the Offences Against the State Act.