A 28-year-old woman is fighting for her life in hospital after being hit by a police van.
The Ford Transit van was on routine patrol when the accident happened in New Road, Bideford, near Longbridge Wharf at about 7.15pm on Wednesday.
The pedestrian suffered what police described as "a life-threatening head injury".
She was taken initially to North Devon District Hospital at Barnstaple but was later airlifted to Derriford Hospital in Plymouth.
The driver of the police vehicle, a serving officer, was uninjured.
In a statement Devon and Cornwall Police said: "The police van was on routine patrol and travelling in the direction of Torrington when the woman crossed in front of the van."
The incident has been referred to the Independent Police Complaints Commission and Avon and Somerset Police have been asked to oversee the force's investigation.
Devon and Cornwall Police confirmed the police officer involved had been "suspended from driving pending the outcome of the investigation".
An eyewitness said they had seen someone lying on the floor covered in blankets who appeared to be bleeding.
A spokesperson for South Western Ambulance Service said a first response vehicle, an ambulance and a doctor attended the scene.
The road was closed, and local diversions put in place, while officers from the police's serious collisions investigation unit examined the scene.