Two more men have been charged in connection with the shooting of black equal rights activist Sasha Johnson.
Prince Dixon, 25, from Gravesend in Kent, and Troy Reid, 19, from Southwark, southeast London have both been charged with conspiracy to murder.
Scotland Yard detectives arrested both men on Wednesday. They were charged yesterday.
Dixon and Reid have been remanded in custody and are due to appear at Bromley Magistrates’ Court later today.
Four people in total have now been charged with the attack on Ms Johnson, 27, at a party in Peckham in the early hours of 23 May.
She remains in a critical condition in hospital.
Detective Chief Inspector Richard Leonard, who is leading the investigation, said “significant progress” had been made over the past three weeks.
But he urged anyone with information to come forward to help “get justice” for Sasha and her family.
“The investigation team have worked tirelessly but we are still struggling with a distinct lack of witnesses,” DCI Leonard said.
“I know that there were at least 30 people there on the night Sasha was shot. Someone must have seen or know something that could help us get justice for Sasha and her family.
“Sasha dedicated her life to a cause she cared passionately about and it is disappointing that people do not feel motivated to help.
“Please come forward. If you know something but are concerned about contacting the police, there are ways that the information can be passed to us confidentially.”
Ms Johnson’s mother, Ellet Dalling, has also appealed for witnesses to come forward.
She told how the attack has left the family “devastated”, and said: “She is currently fighting for her life in hospital with two children asking where their mummy is, what do I tell them?
“Someone must have information to what happened and to come forward. Sasha is passionate about standing up for others, please come forward and stand up for Sasha.
“Come forward to help us, I know it is not always easy but imagine if it was your daughter or the mother of your children. I believe there are people out there that can help.”
Cameron Deriggs, 18, from Lewisham, has been charged with conspiracy to murder. He is due to appear at the Old Bailey on 25 June.
Devonte Brown, 18, from Southwark, has also been charged with conspiracy to murder and is scheduled to appear at the Old Bailey on 7 July.
Anyone with information is asked to call police on 101 quoting reference 1172/23MAY.
Alternatively call Crimestoppers anonymously on 0800 555 111.