Police are investigating an armed robbery that occurred in Shailer Park on Saturday afternoon.
At around 1.30pm, a man carrying stolen items walked out of a business via the emergency exit.
A 19-year-old and a 25-year-old female staff members from the store followed the man and confronted him as he attempted to ride away on a black motorised scooter.
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The man dropped the property and threatened the staff members with a knife forcing them to retreat.
The man picked up the property and fled on the scooter.
The man is described as Caucasian, approximately 20 years-of-age, 185cm tall, slim build and tanned complexion.
The man was wearing a black under armour compression top, light khaki shorts, black socks, black Nike shoes and a black cap.
The two female staff members were not injured.
Police are appealing for anyone with any information that may assist their investigation to contact Crime Stoppers on 1800 333 000.