British police say 10 people have been taken to hospitals after a mass stabbing attack on a London-bound train, nine of them with life-threatening injuries.

In a statement early Sunday, hours after the attack, British transport police also said the incident has been declared a "major incident" and that counter-terrorism police are supporting the investigation.

"Ten people have been taken to hospital with nine believed to have suffered life-threatening injuries," it said. "This has been declared a major incident and Counter Terrorism Policing are supporting our investigation whilst we work to establish the full circumstances and motivation for this incident."

The attack took place as the train headed south towards Huntingdon, a market town a few miles northwest of the university city of

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