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Police looking at the murder of a 17 year old in Brixton tell London's Heart gangs in Lambeth are targetting victims at random.
Kwame Ofosu-Asare was attacked on the Moorlands Estate on Friday.
It's one of a number of attacks in recent days - police are looking at linking some of them - there have been a number of arrests.
Extra police are on the streets of Lambeth.