UK police were Sunday investigating a mass stabbing on a London-bound train that injured several passengers, with a British national the sole suspect in an incident not being treated as a terrorist matter "at this stage".

Here's what we know so far:

- What happened? -

Police were alerted to an emergency on board a train between Doncaster, a town in northeast England, and London's King's Cross Station -- a typically busy route -- at around 7:40 pm (1940 GMT) on Saturday night.

The train was stopped at Huntingdon station in Cambridgeshire, where armed officers backed by police cars, a fleet of ambulances and two air ambulances swarmed the station in the eastern England market town.

"Police boarded the train and arrested two people within eight minutes of the first 999 call," Superintend

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