Four men have been arrested on suspicion of murder after a teenage boy was stabbed to death in south London.
John Ogunjobi, 16, was found unconscious on Greenleaf Close, Tulse Hill just before 23:00 GMT on 5 November and died shortly afterwards.
Four men - aged 22, 20, 21 and 23 - have been taken in to custody at south London police stations for questioning.
The Metropolitan Police said officers were returning to the scene, a week on from John's death.
A post-mortem examination on 8 November revealed he had died as a result of stab wound.
Police are appealing to anyone who may have captured footage or images of the incident on their mobile phone contact them.
DCI Vandenbergh added: "We believe the victim was attacked by a number of suspects and the altercation would have undoubtedly drawn the attention of those who were in the vicinity."
He urged anyone with information to get in touch.