A policeman and two other people were hurt in a two-vehicle crash involving a police car on an emergency call.
It happened on the A9 near Delny in the Highlands at about 15:00 on Monday.
The marked police car was responding to another incident when it was involved in a collision with a black Mazda.
A man and woman who were in the Mazda were airlifted to Aberdeen Royal Infirmary with serious injuries. The policeman was treated at hospital in Inverness and later released.
The man and woman, who are both in their 50s, were not thought to have life-threatening injuries.
The policeman was travelling alone in his vehicle.
The road was closed between Invergordon and Kildary while investigations were carried out.
Police have appealed for witnesses.
Insp David Hynd said: "Both vehicles were travelling southbound and we would ask that any motorists who were in the area who may have dash cam footage get in touch with us.
"The A9 was closed between Invergordon and Kildary to allow for enquiries to take place. It is in the process of reopening and we are grateful to members of the public for their patience while this is carried out."