Three guns, ammunition, tablets and a powder like-substance have been seized in north Dublin.
It followed a number of searches in the Finglas area this morning.
They came as a result of an intelligence-led operation by members of the Drugs and Organised Crime Bureau.
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Two men, aged 18 and 44, were also arrested in the operation.
They are being held at Finglas and Ballymun garda stations, under section 2 of the Criminal Justice Act.
Gardaí say the investigations are ongoing.