LONDON — A knife attack on a train that left 11 people injured on Saturday night was not a terrorist incident, said police, as two British nationals were arrested on suspicion of attempted murder. Of the nine people thought to have life-threatening injuries, four have been discharged, and two "remain in a life-threatening condition," Superintendent John Loveless said in an update on Sunday morning. “At this stage there is nothing to suggest that this is a terrorist incident," he added, noting that both suspects, men aged 32 and 35, were born in the United Kingdom and remain in separate police...