A 16-year-old boy has been named as the victim in a fatal stabbing in west London.
Rishmeet Singh died from a stab wound inflicted during a fight involving a group of people at about 9pm on Wednesday.
Paramedics from the London ambulance service were called to an address on Raleigh Road in Southall.
Social media footage shows an ambulance crew trying to save the boy’s life in the front garden of the house but the teenager died at the scene.
Police have yet to make an arrest and they are now appealing for any information that could help piece together the events of Wednesday night.
DCI James Shirley, who is leading the investigation, said: “My thoughts and those of my team are with Rishmeet’s family and friends at this incredibly difficult time.
“I want to reassure them and the wider community that we are working around the clock to bring the person, or people, responsible for Rishmeet’s death to justice.”
Shirley added: “I want to take this opportunity to reiterate my appeal for anyone who was in the area around Raleigh Road just after 9pm on Wednesday and saw this incident to get in contact.
“You may have vital evidence that could help us progress this investigation.
“I would also ask local residents in the area, or road users who were around Raleigh Road at the time of this attack, to check any footage they may have captured on doorbell, dashboard or CCTV cameras. If you can help, please get in touch.”
Police have put in place a section 35 dispersal order, which gives officers powers to direct people to leave an area, until Sunday afternoon in Southall Broadway, Southall Green, the Havelock Estate, Uxbridge town centre and Hayes town centre.
Residents across Hounslow, Hillingdon and Ealing were told to expect to see an increased policing presence over the coming days.
Ch Supt Sean Wilson, head of policing in the area, said: “Rishmeet’s family have been devastated by his death and my thoughts are with them. Specialist detectives continue to work at pace to find out who was responsible for this attack.
“I would also add my appeal to the public to get in touch if they have any information that could help the investigation.
“I know that this tragic incident will have understandably shocked the local community and our officers throughout the west area share that shock.”
Singh is the 28th teenager to be killed on the streets of London this year.