london ambulance service
A man has been arrested on suspicion of GBH.
The incident took place at Gants Hill roundabout in Redbridge, east London, on Friday evening.
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A bus was caught in cross fire and the driver was injured.
The victim, 21, also sustained knife injuries from an additional attack.
The London Ambulance Service immediately sacked the 21-year-old man.
The killing is the latest in a wave of knife crime which has engulfed the capital this year.
One person has been arrested.
He was pronounced dead at the scene.
Pictures posted online showed a blood-soaked newspaper lying on the floor.