A teenage boy and a man were stabbed to death last night amid a gathering at which people were reportedly taking laughing gas and filming a music video.
Residents in Islington, north London described the "intimidating" atmosphere as the group of around 20 people met at a car park, recorded the video and then became noisy and boisterous.
Mark, 39, said he saw water bottles being hurled at walls when the level of aggression "starting to up a little bit" by around 11pm.
