New Delhi, Nov. 3 -- 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 wi...