The girl who died in Croydon on Wednesday is the 15th teenage victim of homicide in London so far this year.
Of the young people killed, the vast majority, 13, were stabbed, while two were shot.
Here are details of those who died.
June 19 – Khaled Saleh, 17, was found with stab wounds in Paddington Green, central London.
August 7 – Yusuf Mohamoud, 18, was found with fatal knife injuries near a supermarket in Regent’s Park Road, Finchley, north London.
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September 27 – Elianne Andam, 15, was stabbed on her way to school in Croydon, south London.