Detectives investigating the attempted armed robbery of a service station at North Lakes on Monday night have released CCTV images of the incident as they continue to seek public assistance with the matter.

Around 11pm on May 18, a man stood outside the Flinders Parade store before producing a knife and making gestures for the employee to open the doors.

The attendant refused to allow him access and the man fled the scene on foot.

He is described as being Caucasian in appearance, about 190cm tall with an average build. He was wearing a dark jacket, blue trousers  or jeans, a blue shirt, light coloured beanie and was carrying a black bag.

Detectives are investigating whether the same man is responsible for any other similar incidents in the area and are appealing for anyone who may recognise him or his clothing to contact Crime Stoppers on 1800 333 000.