Police in Suffolk, England, suspect a member of the public may have left a gate open in a pasture which had a public right of way, resulting in the deaths of two horses on a nearby road.
Suffolk police said officers were called to the A143 road at Botesdale just after 12.15am on Saturday to reports of a horse on the road.
Moments later, a second call was received saying a vehicle had collided with the animal.
Officers arrived minutes later to find two horses had been involved in collisions. One died after the crash, while the other had to be euthanised because of serious injuries.
An ambulance was called but no-one was taken to hospital.
Officers began inquiries to locate the owner of the horses and to determine what occurred.
They received a call around 10.20am on Saturday reporting the horses missing from a field.
It was thought the horses may have escaped from the field, which has a public right of way through it, after a gate was left open. It was also considered possible there may have been an attempt to take the animals, who then got loose.
Police reminded members of the public walking in the countryside to remember to close and secure gates behind them.
Officers asked anyone with information about the incident to call Constable Stephen Duffell at Suffolk Police on 101.