Members of the public battled to save the life of a man stabbed to death in Thetford last night.

Eastern Daily Press: Police at Brandon Road in Thetford where a man was pronounced dead. Picture Dominic Gilbert.Police at Brandon Road in Thetford where a man was pronounced dead. Picture Dominic Gilbert. (Image: Archant)

Four men have now been arrested after the victim, a man thought to be in his 20s, died at the roadside.

Officers who were on patrol in the area discovered members of the public providing first aid to a man, who had received stab wounds, on the side of the A134 Brandon Road shortly after 7pm.

Police have said they are dedicating "considerable resources" to the investigation as they revealed they had launched a murder probe.

Detective Chief Inspector Phillip Gray, who is leading the enquiry, said: "The investigation is in its very early stages. I want to appeal to anyone who was in the vicinity of Brandon Road, Canon's Close or Canterbury Way or the surrounding woodland to contact the investigating team as a matter of urgency.

"Brandon Road carries a lot of traffic and I would particularly appeal to anyone who has dash cam footage to get in touch with us.

"I also want to reassure the community that we are dedicating considerable resources into establishing exactly what happened. They will see an increased police presence in the area over the following days."

Enquiries are ongoing to establish the exact circumstances leading up to the man's death. Sadly, despite the best efforts of members of the public, police officers and the East of England Ambulance Service, the man, who is believed to be aged in his 20s, was pronounced dead at the scene shortly before 8pm.

Norfolk Police has set up an online information portal as part of the investigation.

The portal has been set up so people can share information with detectives from the Joint Norfolk and Suffolk Major Investigation Team who are now treating the man's death as murder.

Four men have been arrested in connection with the death and remain in custody.

Detectives believe this to be an isolated incident with those involved known to each other.

Any witnesses or anyone with information that may help the investigation can share information with the Joint Norfolk and Suffolk Major Investigation Team.

They can also telephone Norfolk Police on 101 and quote reference Operation Petersfield and a member of the enquiry team will call them back. Alternatively, they can contact Crimestoppers anonymously on 0800 555111 or online.