Police have released video of a man who held up an Adelaide service station in a clown mask.

Officers said the man used a knife to steal cash and cigarettes on Friday night.

“He threatened the staff member and demanded the till be opened,” police said.

Police are searching for a man who allegedly stole cash and cigarettes from a service station in Adelaide while wearing a clown mask. (SA Police)

“The suspect grabbed cash from the till and handed the victim a bag, demanding cigarettes be placed inside.”

It is believed the man left the service station in Parafield Gardens on a postie-style motorbike.

The man is described as being about 183cm tall, with a slim build.

He was wearing a black hooded jumper, navy blue Adidas tracksuit pants, red shoes and he was carrying a black backpack.