An armed man threatened a petrol station worker with a knife during an attempted robbery.
The man entered the BP Service Station on Glasgow Road, Wishaw at around 1.20am on Monday and brandished a knife at the worker while demanding money.
When the 27-year-old woman raised the alarm the man ran off.
The suspect is white, 5ft 7in, of slim build and aged between 20 and 30.
He was wearing a blue jacket with the hood up and dark trousers.
Detective constable Victoria Ross, Wishaw CID, said: “Although nobody was injured, this was a terrifying ordeal for the woman who was simply at her work.
“Officers have been checking CCTV and know that the man was outside the service station for a while before he entered and we are appealing to anyone who may have seen him.
“There were a number of cars and people walking by at the time who may have information that can help. We urge you to come forward.”
Anyone with information is asked to contact Police Scotland via 101.
Alternatively, charity Crimestoppers can be contacted anonymously on 0800 555 111.