Detective Acting Senior Sergeant Karl Day from the Serious Crime Squad said a 28-year-old man was closing the store when an unknown man entered just after 7.30pm.
“The man made his way around to the counter while threatening the attendant with a 15cm knife,” he said.
“The offender stole cash and an amount of tobacco before fleeing.”
He is described as aged between 15-20, about 178cm tall and part-indigenous. He was wearing a black shirt or jumper around his head, an orange and dark blue long sleeve high-visibility shirt with silver stripes, white rigger gloves, grey knee-length short and black sneakers.
It’s believed he fled across Moil Crescent towards Beck Street and Byrne Circuit.
Anyone with information should contact police on 131 444 or Crime Stoppers on 1800 333 000.