Three men and a woman are being questioned following an arms seizure in Dublin.
Gardaí raided a house in the Ellensborough estate at Kiltipper in Tallaght and recovered items including a shotgun, ammunition, telescopic sights and gun components.
The four, who were in the house, were taken into custody late last night, a garda spokeswoman said.
They are aged between 19 and 28 and are being held under the Criminal Justice Act.
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It is understood that the seizure was made after a tip-off from a local source and was in connection with local crime.
There was no indication that dissident Republicans were involved.