A passenger who witnessed a mass stabbing on board a high-speed train heading for London told Sky News he heard someone yelling: "They've got a knife. I've been stabbed."

The witness, who gave his name as Gavin, said there were "extremely bloodied" people and police shouting "get down, get down!" as passengers scrambled to leave the train.

Ten people were taken to hospital - nine with life-threatening injuries - after the incident on the 6.25pm LNER train from Doncaster to London King's Cross on Saturday.

Two people have been arrested and counter-terrorism police have been called in to join the investigation.

Sky News correspondent Gurpreet Narwan at the scene said some of the first-hand accounts were "quite terrifying".

Image: Armed police, transport police, air ambulances and

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