An airport has suspended flights after a plane came off the runway after landing.
An air ambulance came to rest on the grass at Aberdeen Airport, a Scottish Ambulance Service spokesman said.
A statement on Twitter from the airport said: "Flights suspended for around two hours as a result of an ongoing incident. A further update will follow."
A Police Scotland statement said: "We are aware of the incident but on this occasion there was no requirement for police involvement."
No-one has been injured, officials said.
Flights from Aberdeen are being diverted to Edinburgh and Glasgow.
A spokesman for the ambulance service said: "An air ambulance plane on a routine non-emergency transfer from Shetland appears to have come off the runway at Aberdeen while taxi-ing after landing.
"There were no injuries to anyone on board and the patient has been transferred to hospital."
The incident involved an aircraft operated by Farnborough-based Gama Aviation, it is understood.
Fire crews and paramedics were alerted to the scene but none of those on board the plane were hurt as a result of the incident.
There were four crew members and one patient on board at the time.
The plane was transporting the patient from the Shetland Islands to Aberdeen, with a view to taking the patient to the city's Royal Infirmary.
The incident happened at around 11.50am today, Aberdeen Airport confirmed.
It is not yet known whether the aircraft was damaged as a result of the incident.
The incident was thought to have been stood down within half-an-hour but the operation to move the aircraft from the scene has led to the temporary suspension of flights.
The Scottish Fire and Rescue Service confirmed crews were called to the scene at 11.51am.
One fire engine from Dyce "stood by" when it got to the airport, a spokeswoman said.
Other crews initially called to the scene were turned back on their way to the airport.
All fire crews were stood down at 12.18pm.