Police are appealing for more information after a row between two drivers on the A149 last week.
The driver of a red Toyota Pirus was approaching the Queen Elizabeth Hospital roundabout from the Knight’s Hill direction, on the outskirts of Lynn, at around 9.30am on Thursday when he stopped his vehicle.
Another driver got out of his van and then walked towards the car.
An altercation then ensued between the two men in which the van driver attempted to take the other man’s car keys.
But he then snatched the other man’s work identification cards before driving away from the scene.
A woman is also believed to have been inside the van during the incident.
Officers would like to hear from anyone who may have witnessed the incident.
Anyone with information should contact PC Sara Cowen on 101.
Alternatively, witnesses can also call Crimestoppers anonymously on 0800 555111 with any information.