Just after 12.30pm, a man armed with a knife entered the Coles Express service station on Salisbury Highway and threatened staff before fleeing on foot with an amount of cash.
The suspect is described as being about 30 years, 183cm tall, thin build and wearing a grey top with a black hood and black stripes on the sleeves, black trackpants, white shoes, sunglasses and carrying a black/gold plastic bag.