An operation was carried out by detectives from Cabinteely today, resulting in the arrest.
A man in his 20s has been arrested following a number of attempted robberies in Dublin.
Staff at a service station on the Clonkeen Road in south-east Dublin were threatened with a knife after a man entered the shop shortly after 11 o'clock last Tuesday night.
Shortly after, another person entered a pharmacy on Foxrock Avenue and threatened staff at knifepoint.
An operation was carried out by detectives from Cabinteely today, resulting in the arrest.