Detectives will today reveal more details about the deaths of two pedestrians - a man and a woman - on the A47, which they are treating as suspicious.

Eastern Daily Press: On Sunday afternoon, a man and a woman walking along the side of the A47 were both hit by cars and killed. Picture: Ian BurtOn Sunday afternoon, a man and a woman walking along the side of the A47 were both hit by cars and killed. Picture: Ian Burt (Image: Archant © 2014)

Detective Chief Inspector Paul Durham, confirmed that following initial enquiries, the incident, which happened at about 2.15pm on Sunday was now being treated as suspicious, with the focus being on a line of enquiry which suggests the woman was pushed into the carriageway.

DCI Durham said: 'Although our investigation is in its early stages, initial enquiries have given me sufficient cause for concern that this was more than just a tragic accident. As a result I'm appealing to anyone who was in the area at the time and may have witnessed the collision – or seen the two pedestrians shortly before the collision - to come forward, no matter how insignificant the information may seem to them.'

Post mortem examinations carried out yesterday afternoon revealed the man died from severe head injuries while the woman suffered multiple injuries, both consistent with being involved in a collision with a vehicle.

Police are trying to establish why the two people were walking along the busy dual carriageway on the Norfolk/Cambridgeshire border, where the collision occurred, involving a BMW 116 and a Kia car.

Police shut the southbound carriageway for more than seven hours at Terrington St John between King's Lynn and Wisbech near the petrol station.

'All emergency services attended the incident including the air ambulance,' said a spokesman.

Police launched an appeal for people who saw the crash to come forward.

Eye-witnesses reported seeing two people walking hand in hand along the stretch of road before the collision.

One man said: 'I passed them on the single carriageway before the crash.

'The time and direction they were walking all adds up.'

The two deaths add to the horrific toll of tragedy on the A47, which has prompted campaigners to push for improvements to the main east-west route through the region.