Gardaí are searching for a man they believe to have been involved in a robbery in Blackrock, Co Dublin, this afternoon.
Two men were arrested after the post office raid, in which an imitation gun was used to steal an undisclosed quantity of cash at around 3 p.m.
A Garda spokesman said the robbers abandoned their getaway car in Ranelagh.
One man was arrested on Ranelagh Road after being chased on foot by gardaí, while a second was arrested in the area later.
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A third man is still being sought.
There were no injuries and a large quantity of money was recovered, the spokesman said.