Casey Crime Investigation Unit is investigation an armed robbery which occurred on 21 August in Hampton Park.
Police allege that an unknown male and female offender attended the Hallam Road service station at approximately 12:40am.
The man produced a large kitchen knife and made a demand for money.
The man is described as having a Caucasian appearance and 20-30 years old.
He was wearing a blue hooded top and black tracksuit pants.
The woman is described as having a Caucasian appearance, 20-30 years old and long brown hair.
She was wearing a beige hooded top and dark pants.
Police have released CCTV images to the public in the hopes that someone has information about the incident or recognises the offenders in the images.
If you have any information please contact DSC Mark Wiederhold on 9705 3174 or alternatively contact Crime Stoppers on 1800 333 000 or www.crimestoppersvic.com.au and quote incident number 180283562.