Police have released e-fits of the two suspects they want to speak to in connection with the attempted abduction of an RAF servicemen at a base in Norfolk. Two men are being sought in connection with the kidnap attempt outside RAF Marham, near King's Lynn, on 21 July.

The RAF serviceman, who was not wearing uniform at the time, was approached by one of the men while out on a run between 2.45pm and 3.26pm. He was then grabbed by the shoulder and wrist and pulled towards the suspects' vehicle, believed to be a dark-coloured Ford Galaxy.

The victim, aged in his late 20s, was able to fend him one of the attackers by head-butting and punching him. The victim was able to escape after the second suspect, who was armed with a knife, went to the aide of his accomplice.

The suspects, both described as Middle Eastern origin in appearance, remain at large and the vehicle that they used to approach the airbase has still has not yet been located.

Detective Superintendent Paul Durham of the Norfolk and Suffolk Major Investigation Team, who is leading the enquiry, said: "The victim managed to fight off his attacker and head-butted him, we believe around the eye-socket, so it is possible he suffered swelling and bruising in this area.

"He was then punched, which caused him to fall to the ground. Clearly the extent of his injuries is unknown however we do not believe either attack caused the suspect to bleed, contrary to reports circulating in the media. If you know someone who matches the description of our suspect, who has a similar injury, then I would urge you to contact my officers."

Norfolk Police have been carrying out house-to-house enquiries at Marham over the weekend and continue to review CCTV as part of the inquiry.

Durham added: "As I said from the very outset, due to the nature of this incident and the complex investigation required, we expect this to be a lengthy process. CCTV footage continues to be gathered and reviewed while follow-up enquiries are being made after calls put in to the hotlines.

"Tracing the vehicle remains a priority and one point I would like to re-emphasise is that we do believe it may have contained more than the two suspects seen by the victim. This is important because I do not want to deter any potential witnesses from coming forward; it is the vehicle we are interested in, regardless of the number of people seen inside."

Suspect 1 is described as between 20 and 30 years old, approximately 6ft tall, of athletic but stocky build, with dark hair which was long on top and had a well-groomed beard. He was of Middle Eastern origin in appearance with a dark skin tone and wore dark casual clothing.

Suspect 2 is described as between 20-30 years old but younger than the first suspect and of a slimmer build. He was approximately 5ft 10, clean shaven with short dark hair. He was also of Middle Eastern origin in appearance and wore a white t-shirt and dark shorts.