Detectives are appealing for public assistance following two armed robberies and an attempted armed robbery in Reservoir and Ivanhoe earlier this month.

Investigators have been told a man attended a store on Broadway on Sunday 17 April about 6.40pm.

Once inside the store he threatened the attendant with a knife and made demands for money.

The man stole a quantity of cash before leaving the store on a motorcycle that was parked nearby and drove off in an easterly direction.

Police believe the same man attended another store on Waterdale Road, Ivanhoe on Friday 22 April about 11.55am where he threatened an attendant with a knife.

He made demands for cash however the victim refused and started screaming.

The man has left the store without taking anything and has driven away on what is believed to be the same motorcycle.

Police believe the same man has attended another store on Gilbert Road, Reservoir on Sunday 24 April about 9.45pm.

It is believed the man approached two female attendants with a knife and made demands for cash.

They have handed over a quantity of cash and the man left the store in an unknown direction.

No one was injured in any of the incidents.

Police have released an image and CCTV footage of a man they believe may be able to assist with their enquiries.