A Grovedale petrol station was robbed by syringe wielding offender, police say.

Detectives are on the hunt for an man who ran into the Caltex service station around 8.30pm on Monday.

Geelong Tasking and Crime Intervention Taskforce Detective Senior Sergeant Stephen Pucar said the man threatened the shop attendant with a syringe before taking off with cash.

The attendant was the only person working at the store at the time.

Police are appealing for anyone who witnessed the incident to contact Crime Stoppers on 1800 333 000.

Extracted from Geelong Advertiser