Police investigating a fatal collision involving a car and an ambulance in Shropshire are urging the people who stopped to help to contact them.
The driver of a car, a man believed to be in his 50s, died at the scene on the A458 near Shrewsbury on Saturday.
He has not yet been formally identified but it is thought he comes from the Shrewsbury area. The ambulance driver sustained minor injuries, police said.
Both vehicles left the road resulting in it being closed for several hours.
A post-mortem examination is expected to be held later this week.
'Stopped to assist'
Investigating officer PC Paul Bosley said anyone who witnessed the collision should contact West Mercia Police.
"Police investigations are continuing to establish the full circumstances which resulted in this tragedy," he said.
"I am also aware that several people stopped to assist but left the scene on seeing that paramedics were already there and urge them to get in touch as they may be able to assist the investigation."
Police said they believed the car, a blue Nissan Micra, was travelling from the direction of Condover towards the A458 when it collided with a marked ambulance travelling towards Shrewsbury from the direction of Much Wenlock.
A passing doctor confirmed the death of the driver of the car.
The female patient in the ambulance was not injured and continued her journey in another ambulance.