The victim of Friday’s shooting in Plumstead has been named as Eniola Aluko, 19, of Thamesmead.
He was shot in the neck and chest in a car park just off Hartville Road.
A murder investigation has been launched with two males aged 16 and 17, and a 17-year-old girl plus 18 year old male arrested on suspicion of murder.
They have been bailed until early July pending further enquiries. An 18 year old remains in custody.
Detective Inspector John Marriott, of the Met’s Homicide team, said: “I am continuing to appeal for anyone who was in the area at the time, who saw or heard anything suspicious to contact police.
“The shooting took place not far from Plumstead Railway Station and I would urge anyone who was commuting to or from this station to come forward. It was also sunny at the time and a number of people would have been enjoying the weather in the area of Plumstead Gardens; I need you to come forward.
“Although we have now made five arrests I am continuing to ask for your help to progress this investigation.”
Anyone with information is asked to call the incident room on 020 8345 3715 or via 101 quoting reference Cad 6004/14June.