LONDON — British police said Sunday that one of two men arrested in connection with a mass stabbing attack that spread fear and panic on a London-bound train a day earlier has been released without charge, and that one person, a “heroic” member of the railway staff, remains in a life-threatening condition.

In a statement Sunday evening, police said the only remaining suspect is a 32-year-old British man who remains in custody on suspicion of attempted murder. A second man initially arrested as a suspect was released without charge after it was determined the 35-year-old was not involved.

Police said they are not treating the stabbings as an act of terror and are confident they are not looking for anyone else in connection with the attack. They have not disclosed a possible motive or the

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