Police investigating the attempted abduction of a serviceman near RAF Marham have vowed to crack the case, though they admit it could still take many months.
Sixty detectives are working on the inquiry into the attack, which happened on Squires Hill on the afternoon of July 20.
But, despite receiving 550 calls from the public following the release of e-fits of the alleged attackers, who are said to be of Middle Eastern origin, there have been no confirmed sightings of them or the vehicle they used in the incident.
However, Det Supt Paul Durham, who is leading the inquiry, said: “I’m confident we will get to the bottom of this case.
“It’s going to be old fashioned detective work which gets the breakthrough and that could take several months.”
Fifty officers from the joint Norfolk and Suffolk major investigation unit are working on the investigation, along with 10 officers from the Metropolitan Police counter-terrorism unit.
Although the exact motive for the attack is still unclear, Det Supt Durham said their approach to the case had not changed.
He said: “I stated from the outset this would be a lengthy inquiry due to the remoteness of the location and sporadic nature of CCTV in the area.
“This means we’ve had to widen our search and naturally this work, when done thoroughly, takes time.
“CCTV remains a key focus of our inquiry and between 50 and 60 hours has been viewed.
“Footage is being viewed frame-by-frame. That’s the level of detail we are looking at and there’s equally as much to review.”
The victim, a serviceman in his late 20s, is still off work and receiving support.
Police have also issued a fresh appeal for anyone who was driving in the Marham area on the afternoon of the attack to come forward.
Det Supt Durham said: “We know through the CCTV work that there’s a number of people travelling in Marham on the day of the incident between 2.55pm and 3.15pm, specifically on Squires Hill, Ladywood Road and Burnthouse Road areas, who haven’t come forward.
“This could be because they didn’t see anything they felt was significant.
“But, whether they witnessed anything untoward or not, I would urge these people to come forward with their vehicle details so we can rule them out of our enquiries.”
Anyone with information should contact the Norfolk and Suffolk Major Investigation Team via the non-emergency 101 number or call Crimestoppers anonymously on 0800 555111.