Emergency services are at the scene of a derailed train near Stonehaven, Aberdeenshire.
Smoke can be seen billowing out from the train - which is believed to have come off the tracks and fallen down an embankment - in footage shared on social media.
Videos shows a number of emergency vehicles, including an air ambulance, at the scene.
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First Minister of Scotland, Nicola Sturgeon tweeted saying: "This is an extremely serious incident. I've had an initial report from Network Rail and the emergency services and am being kept updated. All my thoughts are with those involved."
She later said there had been 'early reports of serious injuries' and confirmed a 'major incident' had been declared.
In a tweet the British Transport Police said: "We're currently responding to an incident on the line in Stonehaven, Aberdeenshire, where a train has derailed.
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"Officers were called to the scene at 9.43am and remain there alongside paramedics and the fire brigade. All further updates will be shared here."
ScotRail say they are 'assisting emergency services' and Network Rail Scotland wrote: "We are working alongside the emergency services to respond to an incident involving a train near Stonehaven. It is too early to confirm the exact nature and severity of the incident and more details will be made available once known."
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