It's believed the weapons were destined for a revenge attack, after the gangland murder of Noel Duggan earlier this week.
Among the haul were two AK47 assault riffles, two handguns with silencers and 500 rounds of ammunition.
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Journalist with the Herald and Irish Independent Conor Feehan says the weapons were being stockpiled as part of an ongoing fed between the Hutch and Kinihan families in Dublin.
