The Metropolitan Police’s Specialist Crime Command is investigating the stabbings and an extensive crime scene is in place while urgent enquiries are ongoing.
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Police believe a large number of people were present when the attack took place and are urging witnesses and those with information to come forward.
Chief Superintendent Andy Carter said: “My thoughts are with the families of the two victims who have suffered such an unimaginable loss in this shocking and unacceptable incident.
“A man and boy have lost their lives and we must now work together to identify those responsible and remove them from our streets.”