Three people have been arrested by detectives investigating the murder of Takayo Nembhard at the Notting Hill Carnival.
The 21-year-old was attacked near Ladbroke Grove station and died in hospital from a stab wound.
Two men aged 23 and 18, were arrested on suspicion of murder at a residential address in Bristol on Wednesday. They are being questioned at a Bristol police station.
A woman, 20, was also arrested at a residential address in Islington on suspicion of assisting an offender, Scotland Yard said.
She has been taken to a north London police station where she remains in custody.
Takayo, a talented rapper who had travelled from his Bristol home, was at the last day of Notting Hill Carnival on August 29 when he was attacked.
Detective Chief Inspector Jim Shirley from the Metropolitam Police’s Specialist Crime Command, said: “Ever since the tragic murder of Takayo, my team and I have been busy behind the scenes gathering intelligence and evidence to bring his killers to justice, and we will continue to work around the clock until they are behind bars.
“While it is positive that we have made three arrests today, the hard work does not stop here. We are continuing to appeal for witnesses to come forward. Takayo was stabbed to death in broad daylight in front of a huge crowd of people. I am confident that there are people out there who have not yet spoken to us, for whatever reason that may be.
“If you saw something and have not yet spoken to us, please do so as a matter of urgency. Don’t do it for me, do it for Takayo’s family who are still trying to come to terms with their terrible loss.”
A post-mortem examination held at Westminster Mortuary on 1 September gave cause of death as a stab wound to the right groin femoral artery.
Information can also be provided by calling the incident room directly on 020 7175 220 by calling 101 or by tweeting @metcc quoting 7478/29AUG.
Anyone wishing to remain 100 per cent anonymous can contact the independent charity Crimestoppers by calling 0800 555 111 or by visiting www.crimestoppers-uk.org. They never ask for your personal information and they do not track your device.