Gardai in Arklow are investigating a robbery at a service station in the town on Tuesday evening.
A man wearing a mask and armed with a knife entered the Safeway service station close to the Wheelie pump corner on the Dublin road at around 5pm.
He threatened staff and demanded cash.
The man fled from the area on foot.
Gardai have arrested a man in connection with the incident.
He is being questioned at Arklow Garda station.