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Other men were spotted cycling at the scene outside Island Gardens DLR Station. At one point, a woman is seen with a baby in a pushchair just yards away from the knife-wielding thug.
Police from British Transport Police are hunting a knifeman who fled the scene after two people were stabbed at a Kennington Underground Station late on Wednesday night
The attacks at Beckenham Junction station and Kennington Underground station on Wednesday came as Sadiq Khan said he was cracking down on crime - ahead of his fight for a third spell in City Hall.
The incumbent Mayor visited Greengates Stables in Barnet on Thursday to launch Labour's nationwide local elections campaign - which also includes the London mayor election on May 2.
Footage shows the trio sprinting from exit at Beckenham Junction Station just before 4pm yesterday, moments after a man was repeatedly knifed in full view of commuters.