The 250th person to be fatally stabbed in Britain this year was a 16-year-old drill rapper known as JaySav.
Friends of the teenager, known as John, said he was in a local gang called Lower Tulse Hill (LTH), who made rap music videos bragging about their exploits.
It is claimed that in his music he rapped about “cheffing” people – or stabbing enemies.
He also allegedly bragged about “drugs, money and skeng” – slang for a pistol.
The latest slaying is the fifth knife murder in London in just six days and brings the number of homicides in the capital so far this year to 117.
The statistics have been compiled by Anti-Knife UK.
A female friend said: “John was in a gang, he had enemies.
“They did things – you know like gang stuff. Whoever did this, they were not targeting John – they rolled up on his gang.
“John must have been on his own and that’s why they targeted him.
“He was stabbed five times, in the heart and in the stomach. John was the youngest of three in his family, he was fun, he had a lot of banter.
“Everyone in the area knew him as a fun guy.”
A witness recounted the moment John was attacked.
The middle-aged woman who lived on the Tulse Hill Estate said: “A car drove onto the estate and then the boy was left laying on the floor.
“I was absolutely terrified – his stomach had been slit open.
“The boy’s mum came driving down in an Audi and sounded the horn again and again.
“She was screaming ‘save him, save him, God save my boy.”
The latest fatality comes after Ayodeji Habeeb Azeez, 22, was knifed to death in broad daylight in Anerly, south London on Sunday afternoon.
The Metropolitan Police launched a murder investigation after they were called to the scene at about 12.30pm.
An air ambulance was scrambled to the scene but despite the efforts of paramedics, the victim was pronounced dead at 1pm.
Two men – aged 19 and 21 – were arrested on suspicion of murder on Sunday evening and both have been released under investigation.
In Birmingham, a man has been arrested on suspicion of murder after a 41-year-old man was stabbed in the head in the early hours of Saturday morning.
The victim, Bile Mohammed Siyad, was rushed to hospital but later died of his injuries.
A man has been charged with the murder of the dad-of-two.
Teenager Jai Hughes, also known as Jai Sewell, who was just 15, became the youngest stabbing victim after he was ambushed outside a chicken shop in Bellingham last week.
Meanwhile, the 17-year-old stabbed to death outside Clapham South Tube Station was named as a college student Malcolm Mide-Madariola.
He was from Peckham, south-east London, and was a student at a college near the scene where he was attacked, the force added.
On Halloween,”adored” father Rocky Djelal, 38, was fatally stabbed in broad daylight in Southwark Park in Rotherhithe, south-east London.On Monday, the Mayor of London warned it could take a generation to turn the tide of violent crime in the capital.
Sadiq Khan said their deaths were “a terrible waste of young lives”, as he offered his condolences to the families.
Metropolitan Police Commissioner Cressida Dick, who is Britain’s top officer, said on Friday that “stretched” forces must prioritise serious violence and drug gangs, rather than non-criminal acts of misogyny.
The London Mayor has blamed rising violence on £700 million cuts to the Met’s budget over seven years, with more expected to come.
On Friday, Mr Khan announced the latest measure in the “public health approach” to tackling violence, with a review of the most serious offences since 2014 to discover the trends behind attacks.
It comes as the number of children carrying knives continues to soar with 69,000 child woundings in the year so far to June – an increase of 4,000 compared to 2017.