Police have closed a road close to the married quarters at RAF Marham following an incident this afternoon.
Officers were called just before 3.30pm to reports a man was approached by two other men in the Burnthouse Road/Ladywood Road area.
The men threatened the victim with a knife before making off in a dark coloured Ford Galaxy.
The victim, a serviceman, was not injured. He was not in uniform at the time of the incident.
The road is closed from the junction of Marham Road to Squires Hill while officers carry out their enquiries and is likely to be closed for some time.
Police are currently working with military personnel.
Police say they've received more than 20 calls and names of suspects following a Crimewatch appeal over the serviceman attack at RAF Marham.
Reconstruction of attempted abduction of an RAF Marham serviceman will feature on BBC's Crimewatch programme tonight.
A servicemen who was the victim of an attempted abduction at RAF Marham in Norfolk says his world has been turned upside down.