Police say the ‘enormously shocking’ attack happened just after 2.30 this afternoon in Paradise Road on the Clapham/Stockwell border.
The teenager was pronounced dead at the scene, and officers are working to identify him and contact his family.
Superintendent Gabriel Cameron, who is leading the local policing response, said:
“This is an enormously shocking incident which I imagine will cause huge distress to the local community.
“Our thoughts are with the young boy’s family at this devastating time.
“Local officers are on the scene gathering CCTV and speaking to witnesses to piece together what has happened. They will be supported by specialist homicide investigators shortly.
“Please rest assured we will work around the clock to identify and find those responsible.”
No arrests have been made at this early stage of the investigation.
A crime scene and cordons remain in place while emergency services undertake their enquiries, which are ongoing.
If you were a witness or have any information, please call police on 101 with the reference 4116/4MAR.
You can also contact the independent charity Crimestoppers on 0800 555 if you want to remain anonymous.
