Four people have died after a car crashed and caught fire in the early hours of Sunday morning.
Police said the casualties had been confirmed following "highly complex work" by emergency services.
The single-vehicle accident happened on the A5 in Bedfordshire near Heath and Reach, Leighton Buzzard, at around 3.40am yesterday.
The smash left the car in a field ablaze, Bedfordshire Police said.
Officers said a man who had been travelling in the car was pronounced dead at the scene.
Today, police confirmed three other people travelling in the car had also died.
Investigators are appealing for witnesses with dashcam footage who may have information about the incident.
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They said work at the scene is likely to continue into Tuesday.
Acting Sergeant David Burstow, from Bedfordshire, Cambridgeshire and Hertfordshire Serious Collision Investigation Unit, said: "We are doing our work in a dignified and meticulous manner in order to establish what happened in this tragic, awful incident.
"We believe there were four people in the car who sadly died in the collision.
"Specially trained officers are speaking to their families and are offering them support, while forensic identification is still to take place.
"While we believe no other vehicles were involved. Our investigations are ongoing into the circumstances surrounding the incident.
"At this point we are keen to reiterate the requests of the families involved not to speculate on social media, but I would appreciate any information from witnesses or anyone else who may be able to assist us with our inquiries.
"We would be particularly interested to hear from anyone with dashcam or CCTV footage which could help with our inquiries."
Anyone with any information can contact Bedfordshire Police through the online reporting centre or call 101, quoting Operation Loddon.
The crash was the second major accident on the A5 this week after a fatal collision at Hockliffe on Monday.
Further north up the A5, a car caught fire near Oswestry after two vehicles crashed on September 29.
Two people were taken to hospital for checks and the burned out car, pictured above, was removed.
