Police have released CCTV images as they investigate armed robberies at four service stations across Sydney’s south-west in the last two months.

In October 2014, officers from the Metropolitan Robbery Unit formed Strike Force Kilgour to investigate armed robberies at service stations in the south-west.

About 12:30am Sunday 11 October 2014, a 26-year-old man was working as an attendant at a service station on Bexley Road, Campsie, when a man entered and approached the counter.

At the time the man was wearing a dark sweatshirt and black tracksuit pants, and he threatened the attendant with a knife demanding cash. The attendant complied handing over a sum of cash.

The man ran from the store. The attendant received a small cut to his hand as a result of the incident.

About 12.40am Saturday 25 October 2014, a 24 year old man was working as an attendant at a service station on Milperra Road, Revesby, when a man entered the store.

The man was wearing a red sweatshirt with a black hood, yellow gloves and had facial hair.

The man threatened the attendant with a knife and demanded cash.

An amount of cash was handed over before the man ran from the shop. No one was injured as a result of the incident.

About 2.10am Wednesday 19 November 2014, an 18-year-old man was working as an attendant at a service station on Chapel Road, Bankstown, when a man entered and approached him.

The man was wearing a red sweatshirt with a black hood, dark pants, and his face covered.

He threatened the attendant with a knife, demanding cash. The attendant complied and the man left with cash. No one was injured as a result of this incident.

About 1am Saturday 22 November 2014, a 32-year-old man was working as an attendant at a service station on Canterbury Road, Hurlstone Park, when a man entered and approached him.

The man was wearing grey hooded sweatshirt, dark pants, had his face covered with a mask and had short dark hair.

He demanded cash while threatening the attendant with a knife and a firearm. The man then ran out of the shop empty handed. No one was injured as a result of the incident.