Four people died on East Sussex roads on Saturday night, two pedestrians at Ringmer and two in a car at Cross in Hand.
Police say a 37-year-old Uckfield woman was driving a 4×4 Nissan Pathfinder involved in a collision with pedestrians walking in a group along Harveys Lane, off the B2102, outside Ringmer just after 8pm.
Two men died, both aged 31, one from Wimbledon, south west London, and the other from Tunbridge Wells.
Two women, a 29-year-old from Wimbledon, and a 27-year-old from Addlestone, Surrey, were treated for minor injuries at the Royal Sussex County Hospital in Brighton and discharged.
Three other pedestrians in the group, a 29-year-old man from Addlestone, a 24-year-old woman from Morden, and a 31-year-old woman from Sutton, both in south London were unhurt.
The car driver was also unhurt.
Sergeant Huw Watts of the Surrey and Sussex Road Policing Unit said: “We ask anyone who saw what happened to contact us via firstname.lastname@example.org,uk or by calling 101, quoting Operation Greenwich.
“If anyone has any dash cam footage or CCTV, relating to this incident, we would be particularly interested to hear from them.”
A second crash in East Sussex at Cross in Hand just before 11.30pm the same night left two more people dead.
A Mini Countryman travelling north and a Ford Ranger travelling south collided on the A267 at a junction with Meres Road, north of Cross-In-Hand.
A 55-year-old man driving the Ford and the 48-year-old woman who was his passenger, both from Heathfield, died at the scene.
The Mini driver, an 18-year-old man from Heathfield, sustained serious injuries and was taken to the Royal Sussex County Hospital in Brighton.
His passenger, an 18-year-old woman from Newick, was treated at the same hospital for minor injuries.
Sergeant Huw Watts of the Surrey and Sussex Road Policing Unit said; “Anyone who saw what happened is asked to contact us via email@example.com or by calling 101, quoting Operation Edenberry.
“If anyone has any dash cam footage or CCTV relating to this incident, we would be particularly interested to hear from them.
“We are seeking all witnesses to the collision and any incidents leading up to it, especially the driver of a minibus seen near the area after the collision occurred.”
East Sussex Fire and Rescue Service attended both incidents and Assistant Chief Fire Officer Mark O’Brien said afterwards:
“This is clearly a terrible time for the families and friends of those who have lost their lives.
“We do not know precisely what happened – the exact circumstances are being investigated.
“We would urge that everyone takes extra care and looks out for each other when on our roads.”