A "heroic" rail worker who tried to stop a knife attacker as he carried out a mass stabbing on a high-speed train remains in a life-threatening condition.

A 32-year-old man who was arrested after the 6.25pm Doncaster to London King's Cross LNER service on Saturday was stopped at Huntingdon, Cambridgeshire, is being treated as the only suspect, police said.

The man who is from Peterborough, where he boarded the train, is being held in custody on suspicion of attempted murder, while another man, 35, who was also arrested has been released with no further action.

Train stabbing latest: Two victims still fighting for lives

A knife was recovered at the scene after armed police were deployed to the train and made the arrests within eight minutes of the 999 call.

In total, 11 people were tr

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