An 18-year-old man from east London was arrested on Monday, 9 April on suspicion of murder. He has since been released under investigation.
Police were called at approximately 22:00hrs on Monday, 2 April, to Markhouse Road, E17 to reports of shots fired.
Officers and the London Ambulance Service attended and two teenage boys, aged 16 and 15, were found injured.
They were both taken to an east London hospital. The 15-year-old boy was treated for non-life threatening injuries.
Amaan Shakoor, 16, had suffered a gunshot injury and died in hospital at 17:45hrs on Tuesday, 3 April. His next of kin were at the hospital when he passed away.
A post-mortem examination held on Friday, 6 April, gave the cause of death as gunshot injuries to the head.
The investigation is being led by Detective Chief Inspector Gary Holmes of the Met’s Homicide and Major Crime Command.
DCI Gary Holmes said: “It is just over one week since Amaan Shakoor was brutally murdered. Somebody somewhere knows who committed this terrible crime and I would urge that person to come forward and share this information with us.
“This murder has left Amaan’s family completely devastated and desperate to understand why he was taken from them.
“If you know or even suspect who committed this murder then please help me to bring justice for Amaan’s family and make the community a safer place for other young people.”
The victim’s family are being supported by specialist officers. They have requested that their privacy is respected as they come to terms with the death of Amaan.
Anyone with information is asked to contact the incident room on 020 8345 1570 or via 101 quoting reference 6727/02 April. You can also tweet information to @MetCC.
To give information anonymously contact Crimestoppers on 0800 555 111 or online at crimestoppers-uk.org