A pensioner on a mobility scooter was run over by a vintage tractor at a country show, police said.
The unattended vehicle was part of a static display at the Dorchester Showground when it started rolling down a hill on Saturday, a spokesman for Dorset Police said.
It collided with the 72-year-old from Weymouth, who became trapped under under her scooter and the tractor.
She was freed by emergency services and taken to hospital with bruising to her left leg and upper left arm.
The owner of the tractor was not present at the time of the incident, officers said.