A man in his late teens from Clondalkin was arrested last night after Gardai seized firearms and ammunition.
The man was stopped by when cycling in the Clondalkin area of Dublin at 1.45 a.m.
He escaped on foot but was arrested a short while later on Shancastle Crescent.
Gardaí later discovered two guns and some ammunition in a bag he was carrying.
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The man is being held at Lucan Garda station under Section 30 of the Offences Against the State Act.