Two men and two girls were arrested last week over the murder of a man in Hendon during an apparent robbery in broad daylight.
Police and paramedics were called to Hendon at 4.45pm on Thursday and found the 38-year-old man at the junction of Brent Street and Parson Street.
Shomrim Jewish communal security and the Hatzola medical emergency service also attended the scene. Despite their efforts the man, who is not thought to be Jewish, died at the scene just before 5.30pm.
Two men aged 19 and 20 and two girls aged 16 and 17 have been arrested in connection with the incident and remain in police custody.
• Anyone with information is asked to call police on 020 8358 0200, or Crimestoppers on 0800 555111