Scotland Yard last night launched a murder investigation after a 16-year-old was stabbed to death in Tulse Hill, Lambeth.
Police were called to Greenleaf Close at around 10:53pm to reports of a shooting and find the 16-year-old unconscious in the street.
Despite the best efforts of paramedics from the London Ambulance Service (LAS), who also attended, the teenager was tragically pronounced dead at the scene at 11:41pm.
His next-of-kin have been informed.
Officers believe at this early stage that his fatal injuries were caused by stabbing, not gunshot wounds.
A post-mortem examination will be arranged in due course, police said.
The Homicide and Major Crime Command have been informed and will lead the investigation.
No arrests have been made at this stage, said police, and their enquiries are ongoing.
The tragic death marks the fifth fatal knife murder in south London in just six days – including of two more teenagers.
Teenager Jay Hughes, 15, was stabbed to death outside a chicken shop in Lewisham on Thursday, while Malcolm Mide-Madariola, 17, of Peckham, was killed outside Clapham South tube station.
Two men were also stabbed to death this week, including Rocky Djelal, 38, of Bermondsey, who died after being knifed in Southwark Park in broad daylight.
The other man, who was 22 but has not yet been formally named, was killed after being knifed in Anerley, Bromley.
Any witnesses or anyone with information should contact police on 101 quoting CAD 8349/05 Nov.
To remain anonymous please contact Crimestoppers on 0800 555 111.
You can also tweet police via @MetCC.