Detectives from the Homicide and Major Crime Command have launched an investigation after a teenager died following a stabbing in Walthamstow.
On Thursday, 16 November at 23:14hrs police were called to reports of a group of males armed with weapons in Mount Pleasant Road, E17.
At the scene, an 18-year-old man was found suffering a stab wound to the stomach.
The injured man was taken to an east London hospital by London Ambulance Service for treatment to his injuries.
He subsequently died in hospital on Monday, 20 November.
His next of kin have been informed; formal identification awaits.
A post-mortem examination will be scheduled in due course.
There have been no arrests and enquiries continue.
Any witnesses or anyone with any information is asked to call the incident room on 020 8345 3775 or contact police via Twitter @MetCC.
To give information anonymously contact the independent charity Crimestoppers on 0800 555 111 or online at crimestoppers-uk.org.