A teenager who was stabbed near to South Harrow Underground Station has died.
Hussein Ahmed, 19, from Edgware was pronounced dead on Wednesday, 23 November, after life-support was withdrawn.
A post-mortem examination will commence at Northwick Park hospital mortuary on Thursday, 24 November.
Detectives continue to appeal for witnesses and information to assist what is now a murder investigation.
On Friday, 18 November, police were called at approximately 17:10hrs to reports of a man stabbed outside Kebabish takeaway on Northolt Road, Harrow.
Officers and London Ambulance Service attended and found Hussein suffering a stab wound. It is thought that he was attacked by a group of males, all of whom are described as black and believed to be aged in their teens or 20s.
Hussein had been riding his bicycle shortly before the stabbing. This bicycle was recovered near to the scene.
A 17-year-old male [victim 2] also sustained a minor laceration to his abdomen during the incident. He was taken to hospital for treatment and later discharged.
Detectives from the Homicide and Major Crime Command investigate the murder.
Any witnesses or anyone with information that may assist the inquiry is asked to call the incident room on 020 8358 0400.
To give information anonymously contact Crimestoppers on 0800 555 111 or visit crimestoppers-uk.org.
Detectives investigating the murder have made four arrests.
The four, aged in their late teens or early 20s, were arrested on Monday, 21 November, on suspicion of attempted murder. They were taken to a north London police station before being released on bail until early December pending further enquiries.