A police dog handler is in a critical condition and another man is stable following a serious collision on the A90 near Peterhead.
It involved a Police Scotland van and a Vauxhall Astra and happened at Auchiries, Longhaven, about 11.50pm on Tuesday.
The van was being driven by a 46-year-old officer with two police dogs in the rear.
A 58-year-old man was driving the car.
Both were freed by fire crews and taken to Aberdeen Royal Infirmary for treatment.
The family of the officer is aware of his condition and efforts are urgently ongoing to trace relatives of the other driver.
Road Policing Inspector Jon Barron said: “Our inquiries into the circumstances of this crash are obviously still at an early stage.
“I would be very keen to speak with anyone who may have seen either vehicle shortly beforehand, or anyone who witnessed the collision and who hasn’t yet been spoken to by Police. Please contact us on 101.”
The A90 was closed for several hours while collision investigators examined the scene. The road has since re-opened.
The dogs were taken to a local vet for examination. One appears to be uninjured and the other is still being assessed.