Gardaí are searching for a container of stolen cigarettes valued at £1.5 million.
The cigarettes were stolen from Dublin Ferry Port last night when three masked men, one armed with a handgun, held up the consignment.
A security guard was locked in a toilet while another was held in a car. He was later released unharmed in the Phoenix Park.
Gardaí are looking for a Scania lorry with a container and three men. Two of the men are thought to be in their thirties and the other to be in his twenties.
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All three are roughly five foot and eight inches in height.