A murder investigation continues following the death of a 16-year-old boy in Lambeth.
Officers attended along with the London Ambulance Service (LAS) and found a 16-year-old boy collapsed in the street with stab injuries.
He has been formally identified as John Ogunjobi, 16, of Tulse Hill.
Enquiries are ongoing to establish whether a firearm was discharged.
DCI Vandenbergh said: “I am appealing to anyone who has information that could assist this investigation to come forward and speak to police.
“Did you see or hear anything? If so, no matter how insignificant you think it may be, please call – your information could prove to be crucial.”
Anyone with information is asked to contact the incident room on 020 8721 4961 or call Crimestoppers anonymously on 0800 555 111.
There have been no arrests and enquiries continue.
“We have seen a spate of fatal stabbings in south London recently with five murders over the course of the last week. One murder is one too many with the devastation it causes to families, friends and communities difficult to comprehend.
“Tackling violence is a priority and one which remains at the forefront of all the work we do. This includes utilising our local resources but also supplementing them with resources from across the Met, including the Violent Crime Taskforce. Extra officers have been assigned to the Central South Command to work alongside local officers – you will see them out and about on patrol.
“The support of the community is vital in the work we do, including combatting violent crime. I would urge anyone who has witnessed a crime, violent or otherwise, to contact police as soon as possible and help us to remove violent individuals from our streets.
“If you have any questions or concerns, please do approach any officer that you see patrolling the area. They will be happy to speak with you.”