Detective Chief Inspector Andrew Packer, who is leading the murder investigation, urged partygoers to contact Scotland Yard.
He said: “Our enquiries so far have established there was a large group of young people from east and south London who attended this party and I need to trace as many people as possible to piece together the events that led to this murder.
“The stabbing occurred in the street and would have been clearly visible to passers-by and residents who may have been disturbed by the noise of the fight.
“This was a brutal attack that has taken a man’s life and I am urging anyone with information to come forward and speak to police.”Yes, it's terrible when the public won't co-operate and refuse to tell the police anyth...
Oh! Hang on!
Describing the party, a neighbour, 34, said: “It was crazy. We were telling police that it was getting worse but they said they couldn’t do anything as it was a private event.
“They were playing grime music so loud and the crowd was getting more boisterous. They were swarming like bees. They all found out about it on social media.
“There were hundreds of kids waiting outside like a West End nightclub. It should’ve been shut down earlier.
There were scuffles everywhere. They were so many people rowing they were scattering in all directions.”Ah, if only the police had turned up then, there might not have been a murder, and they could have spent their time doing what they prefer, chasing people for Facebook comments instead...