A teenage boy has been arrested on suspicion of murder after 17-year-old college student Malcolm Mide-Madariola was stabbed to death outside Clapham South Tube station.
The male suspect, also 17, remains in custody after being detained following the fatal stabbing in Balham Hill.
Mr Mide-Madaloria was rushed to hospital after the incident, at around 4.35pm on Friday, but died a short time after.
Scotland Yard is continuing to search for information surrounding his death.
Detective Chief Inspector John Massey said: “While we have made an arrest and this investigation continues to move at pace I would reiterate my appeal for information.
“The stabbing in Balham Hill followed an altercation a few minutes earlier involving two small groups of young males near to Clapham South Underground station. However I don’t believe anyone involved had travelled on the tube.
“There were a large number of people present when emergency services arrived at the scene, and although many have come forward, I want to ensure that we have spoken to all potential witnesses.”
Friends of Mr Mide-Madaloria, who lived in Peckham, has been described as a “sweet” boy and piles of floral tributes have been left for him.
A friend of his, who wished not to be named, said: "He was sweet and nice and he always used to message me if he knew I was sad."
A post-mortem into his death is being held on November 5.
Witnesses or anyone with information is asked to contact the Major Incident Room on 020 8721 4868 quoting CAD 5291/02 Nov.
Alternatively they can call Crimestoppers anonymously on 0800 555 111.
