When a video of one of the UK's biggest rap stars being attacked went viral, it marked the start of a series of events that left three young people dead. They died when tensions escalated between rival gangs in Tottenham and Wood Green in the north London borough of Haringey. File on 4 has been told the events that led to their deaths were triggered by an attack on a rapper called Headie One from the Broadwater Farm estate in Tottenham. Tensions were escalated via social media - violent tit-for-tat attacks filmed and posted on Snapchat and You Tube. Livvy Haydock hears the stories of those at the heart of this feud and from those whose lives it has devastated.

Reporter: Livvy Haydock