Police arrested a man on Wednesday on suspicion of robbing the Crew Road Mini Mart earlier in the day.
A masked man armed with a machete robbed the small roadside store on Crewe Road of an undisclosed amount of cash around 10.15am.
He was chased from the scene by a customer, but managed to flee towards Palmdale Drive.
Police issued a description of the robber as dark skinned, around 6 feet tall and of stocky build. He was wearing three-quarter length dark jean pants, a dark hoody, a red baseball cap and had dark cloth material covering his face.
There were two customers and a female cashier in the store at the time of the robbery. No-one was hurt.
Staff at the store said this was at least the fifth time the shop had been broken into or robbed in recent years.
The suspect remained in police custody Thursday.
Anyone who was in the area this morning and witnessed the crime, or the suspect fleeing the scene, should contact George Town CID on 949-4222, or the confidential Crime Stoppers number 800-TIPS.
Staff at the store said this was at least the fifth time the store had been broken into or robbed in recent years.