A 13-year-old boy has been arrested on suspicion of murder, after a 46-year-old man was stabbed to death.
The teenager was arrested on Thursday and remains in police custody.
Dariusz Wolosz, a Polish national who lived in West Drayton, was found with stab wounds in the High Street in Yiewsley, Hillingdon at 0.12am on 4 January.
Paramedics treated him at the scene, but he tragically died half an hour later.
A post-mortem examination carried out on Thursday, 6 January gave the cause of death as stab wounds to the groin and chest.
Family ‘distraught’ over Mr Wolosz’s death
Mr Wolosz’s family are said to be “distraught” as detectives continue their inquiries.
The Met Police have urged anyone with information to contact them and said dashcam footage from passing cars may have captured the incident.
Det Chief Insp Wayne Jolley, Specialist Crime, leading the investigation said: “We believe Dariusz was attacked by a group of males in Tavistock Road following a verbal dispute.
“The group then fled in different directions.
"The area was busy at the time with passing traffic and people driving past could well have captured dash cam footage of the incident, and the moments leading up to it.
"Dariusz’s family are distraught and we are doing everything we can to support them at this time.
"I urge local people to check any doorbell and dash cameras to check them; you may have captured something that could be very significant for us."
Anyone who has information is asked to call 101 or tweet @MetCC, giving the reference 0063/04JAN.
Information can also be provided to the independent charity Crimestoppers, anonymously, on 0800 555 111.
A message from the editor:
Thank you for reading. NationalWorld is a new national news brand, produced by a team of journalists, editors, video producers and designers who live and work across the UK. Find out more about who’s who in the team, and our editorial values. We want to start a community among our readers, so please follow us on Facebook, Twitter and Instagram, and keep the conversation going. You can also sign up to our email newsletters and get a curated selection of our best reads to your inbox every day.