Guard was threatened with iron bar
Police believe that the man was approached by up to four men, shortly before 4pm.
The robbers then made off with the cash box from the van, before escaping in a dark coloured Vauxhall Vectra towards the Ballytromery Road of the village.
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Hide AdThe car was found shortly afterwards in the Cumbria Lodge area of the town.
The security guard was not hurt during the robbery but was left badly shaken.
Police are appealing for witnesses.
They would especially like to hear from anyone who may have seen anything suspicious in the area, around the Mill Road at the time to contact them on 0845 600 8000 or use the Crimestoppers number which is 0800 555 111.