Two men matching the descriptions of those wanted in connection with the attempted abduction of a serviceman near RAF Marham are reported to have been seen in Essex.
Norfolk Police has confirmed a reported sighting near the Colchester army garrison has been investigated.
However, they have indicated they do not believe it is connected to the investigation.
Earlier this week, police issued e-fits of two men, said to be of Middle Eastern origin, who are wanted in connection with the attack near the West Norfolk base last Wednesday.
Yesterday, officers said they had received around 150 calls from the public following the release of the images.
They are also checking through dashboard camera footage obtained from drivers during roadside checks on Wednesday afternoon, one week on from the incident.