A young man has had his life-support machine withdrawn after he was seriously injured during a stabbing near South Harrow Underground station.
Hussein Ahmed, from Edgware, was stabbed outside Kebabish takeaway on Northolt Road, Harrow, last Friday.
Police believe he was attacked by a group of men, all of whom are described as “black and believed to be aged in their teens or 20s”.
Hussein had been riding a bike beforehand, and this has been recovered.
In a statement, police said they had made four arrests already.
“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,” police said.
Anyone with information that may assist the inquiry is asked to call police on 020 8358 0400.
To give information anonymously you can contact Crimestoppers on 0800 555 111.