UPDATE: The dog squad was sent after a man who held up a Night Owl at knife-point in Redbank Plains this morning.

Belinda Campbell was serving customers at 7.30am when the man, wearing green and yellow gardening gloves, walked in brandishing a large knife.

Ms Campbell said he waved the knife in her face and demanded she empty the register.

"I said I can't do anything with you waiving that knife in my face and asked him to stop, which he did. So that was nice," Ms Campbell said.

Although this was the first time Ms Campbell had been held-up during her 20 years working in retail, she remained calm and handed over the cash from the register.

"It's going to happen in this industry. All you can do is keep you money low, don't do anything to upset them and get them out the door as quick as possible," she said.

The whole episode was over in less than two minutes and the man left on foot.

Police sent the dog squad to track him, however the man hasn't been caught.

The store's CCTV footage was taken by police who have now released images of the man described as Caucasian wearing a grey 'Champion' hoodie, black pants, white shoes and the gardening gloves.

The robbery follows a similar incident in Leichardt yesterday when a single man used a knife-like, sharpened instrument to demand money from a woman working at a supermarket.

In that incident, the man, described as Caucasian, slim build, wearing a grey hoodie and beanie, a white t-shirt, dark blue shorts and dark jogging shoes, left without any money.

Police have not made a statement on whether or not the two incidents are related.   

Anyone with information should contact Crime Stoppers on 1800 333 000.

EARLIER: Police are on the scene of an armed robbery at a suburban store.

The Night Owl on the corner of School Rd and Alawoona St was reportedly held up this morning.

Investigations are underway.

Police cannot confirm if there are any links between the latest incident, and an attempted armed robbery in Leichhardt yesterday afternoon.

More to come.