POLICE are appealing for witnesses after three separate armed robberies involving knives and syringes in Sunshine, Altona and Yarraville.

The first incident occurred on 2 February at 2pm when a man entered a pharmacy on Ballarat Rd, Sunshine, and produced a syringe to threaten the attendant.

The man then stole about 15 boxes of medication.

The second incident occurred on 4 April at 12.15pm when a man entered a pharmacy in Harrington Square, Altona.

The man produced a knife and syringe before stealing cash and medication. The third incident occurred 7 April at 3.30pm when a man entered a newsagency on Somerville Rd, Yarraville, and produced a knife and a syringe before stealing cash from the register.

The region two Embona Taskforce is currently investigating the three incidents, which have been linked to a Caucasian man in his late 20s, around 185cm tall, of medium build, with brown hair and brown eyes.

Anyone with information is asked to contact Crime Stoppers on 1800 333 000 or visit www.crimestoppers.com.au.