A 22-year-old man has been arrested in south London following the murder of Catford teenager Kwame Ofosu-Asare in Brixton on March 2.
The 17-year-old victim, a sixth form student at Forest Hill School, died from multiple stab wounds to the chest after he and his friend were chased by two men.
Metropolitan Police have also issued a plea for the driver of a minicab thought to have been used by those responsible for to come forward.
Officers believe the car is a Vauxhall Zafira that the suspects could have picked up in Camberwell.
The vehicle then drove the suspects around for approximately 20 minutes prior to the attack, taking them to the Myatts Field Estate and Vassal Road area before parking up on Moorlands Road.
Police are also examining whether the murder is linked to seven other stabbings across south London that have taken place since February 25.
Detective Chief Inspector John McFarlane, of the Homicide and Serious Crime Command, said: “Kwame was an innocent young man enjoying himself on a Friday afternoon when he was pursued and attacked by two knifemen.”
Commander Steve Rodhouse, head of the Metropolitan Police’s Trident Gang Command, said: “Our priority is to understand exactly what happened to Kwame, an innocent young man, to prevent further incidents.
“There have been a number of stabbings in Lambeth, but I want to reassure the community and the wider public that detectives are working around the clock to gather evidence and find those responsible.”
On Tuesday officers carried out eight raids in Lambeth, targeting the homes of suspected gang members. Two men, aged 19 and 23, and two teenage boys, aged 14 and 16, were arrested. However police say that these arrests were not in relation to Kwame’s murder.
Rodhouse added: “At this stage I believe that this was a random selection of victim and that Kwame could have been attacked by individuals who saw people they did not know on what they perceived to be their territory.”
Anyone with information should call the incident room on 020 8721 4205 or to remain anonymous, Crimestoppers on 0800 555 111.