A fight between youths in a milkshake bar was the spark that led to a 17-year-old youth worker being shot dead in a botched revenge hit, it was claimed last night.
Footage of the punch-up, filmed on mobile phones on Easter Sunday, was shared on Twitter and Snapchat and led to a gunman attacking Tanesha Melbourne in Tottenham on Monday night, locals said.
Police probing Tanesha's murder swooped on the Tinseltown diner in Farringdon, London, and seized CCTV of the fight which shows three men punching and kicking a young black male in a stairwell as a woman lies on top of the victim trying to protect him.
While Tanesha is not thought to be in the clip, youngsters claim it was linked to simmering gang violence in the Wood Green area of north London.
They say the video was the catalyst for the gunman opening fire 24 hours later, and shooting Tanesha.
Tanesha became the 48th person to be murdered in London this year, after getting caught up in a terrifying postcode war ravaging the streets of the capital.
Tanesha's mother Sharon Melbourne arrived at the scene before paramedics and cradled her daughter in her arms as she died near her house in Tottenham.
Also on Monday night, a 16-year-old named locally as Amaan Shakoor, was shot in the face just a few miles away in Walthamstow by 'rival drug dealers', according to a friend.
He died later in hospital, making him the 49th victim of the continuing bloodshed.
Earlier this week, Scotland Yard commissioner Cressida Dick said gangs were using online platforms to glorify street violence and show off 'with weapons'.
Home Secretary Amber Rudd is set to launch a crackdown on online companies later this week.