A man sitting in a van outside a supermarket in Balgaddy, Lucan, was approached by two men who produced a suspected firearm and demanded cash at around 2pm.
They left the scene in a Ford Mondeo Car which was abandoned on Esker Lane a short time later.
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Gardaí carried out a search of the area and two men were arrested.
They're being detained at Lucan Garda station.
Gardaí say they recovered the proceeds of the robbery, as well as a firearm.