11 people injured, police arrest 2 men
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Police said two people who were wounded remain in a life-threatening condition after the attack on Saturday. Passengers reported scenes of panic and chaos ,with many running through the carriages.
British Transport Police say the "heroic" man who tried to stop the attack remains in hospital. Five others have been discharged.
Ethiopian national Hadush Gerberslasie Kebatu had been serving a prison sentence for crimes including the sexual assault of a 14-year-old girl.