Three teenagers have been arrested on suspicion of murdering Khiry Ford with a single stab wound outside a house party in Edmonton, north London.
Detectives are questioning the men, two of whom are aged 18 and one 17, at a north London police station after they were arrested this morning.
Four teenage males had already been bailed to return on a date in January pending further enquiries.
Ford, 23, of Tottenham, north London, died after being stabbed in Haselbury Road, at around 2:45am on Sunday, 30 November.
A post-mortem examination held on Tuesday, 2 December at Haringey Mortuary gave the cause of death as a single stab wound.
An incident room has opened under Detective Chief Inspector Matt Bonner of the Homicide and Major Crime Command.
DCI Bonner said: "Khiry had been with friends at a house party in Haselbury Road shortly before he was stabbed in the street. I believe his attacker was also at this party.
"I continue to appeal for anyone who was at the party to call police. I also want to hear from anyone who witnessed anything suspicious or has information that will help us find the person who stabbed Khiry."
Anyone with information that may assist the investigation should call the incident room on 020 8358 0200 or contact Crimestoppers anonymously on 0800 555 111 or via crimestoppers-uk.org