A teenager who is wanted on suspicion of the murder of Gabriel Petrov Stoyanov in Downham must attend a police station immediately.
George David 16, from Downham, with links to Bromley and Orpington, is wanted on suspicion of murder.
He should not be approached by members of the public, read on for further information.
Detective Chief Inspector Kelly Allen, investigating, said: “Two arrests have been made as part of our investigation but we urgently need to speak to George David. Officers from across the Met are working to trace him.
“George, my message directly to you is that you must attend a police station immediately.
“We believe it’s possible George is being hidden or moved around by people he knows. My message to those people is that if you are working to frustrate our enquiries you should be very much aware of the trouble you could find yourself in. We will seek to arrest and prosecute you to the fullest extent of the law.”
A murder investigation began after Gabriel was stabbed in Bromley Road, Downham on Friday, 4 November.
21-year-old Gabriel was found suffering a stab injury, and died during the afternoon of Saturday, 5 November.
Two boys aged 14 and 17, wete arrested on Thursday, 10 November on suspicion of murder. They remain in custody at a south London police station.
Anyone who sees him is urged to call 999 immediately, reference CAD 8645/4 Nov.