LONDON — British police dismissed speculation on Sunday that a mass stabbing attack on a London-bound train the previous evening was terrorism-related and said two victims remain in a life-threatening condition.

Police also said that two men born in the United Kingdom remain in custody at separate police stations on suspicion of attempted murder. The suspects were arrested eight minutes after the first emergency calls were made at 7:42 p.m. from aboard the train, where passengers had reported scenes of panic and chaos with many running through the carriages and some seeking safety in the toilets.

“This is a shocking incident and my thoughts are with those who have been injured and their families,” British Transport Police Superintendent John Loveless said outside the station in Hunting

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