Just after 7.30pm, a man wearing a black mask, witches hat and a black cape, threatened a console operator at the service station on Military Road, demanding cash.

He fled on foot with a small amount of cash and cigarettes in a black bag, last seen on Wills Street, where a vehicle was possibly parked or waiting.

There were no reported injuries and no weapons sighted.

A short time later following the robbery Western Adelaide CIB Detectives attended a Taperoo address and took a man into custody.

A 21 year-old man from Taperoo was charged with aggravated robbery, resist police, unlawful possession and failing to truly answer questions.

He has been refused bail and will appear in the Port Adelaide Magistrates Court today.