A man was stabbed to death after a large fight broke out in north west London on Thursday.
The victim, aged 35, was knifed in the brawl near the junction of Review and Heather roads, Neasden at 11.30pm.
Police officers gave the man emergency first aid before paramedics took over. He was pronounced dead at the scene shortly after midnight.
The man’s family have been informed and are being supported by specialist officers.
London Ambulance Service said they treated another man for injuries but he wasn’t taken to hospital.
Three men were arrested in the early hours of Friday in connection with the murder. They all remain in police custody.
Dawn Butler, MP for Brent, urged any witnesses to the stabbing to come forward.
She said: “Tragic news to learn of the fatal stabbing in Neasden last night. My prayers are with the family and friends.”
DCI Dave Whellams, from the Met’s Specialist Crime Command, said: “While we are still in the early stages of establishing exactly what happened during this incident, it is clear from the accounts of officers who were first on scene that there were a significant number of people in the area at the time.
“Someone will have seen what happened and will know what led to this senseless loss of life. They may have been filming on their phone, capturing vital evidence even if they don’t know it.
“I would appeal to anyone who knows anything or who has information, no matter how insignificant they think it may be, to come forward.”