one of the 30 guests at a party where black equal rights campaigner Sasha Johnson was shot has come forward to give a statement, police said as they appealed for information.
Detective Chief Inspector Richard Leonard, of the Metropolitan Police, said Ms Johnson, 27, had suffered the most “profound life-changing injuries”.
DCI Leonard said: “Sasha’s mother is devastated but that doesn’t even cover it really. She is with Sasha every day and is struggling to understand why this has happened.”
Police are working through bodyworn camera footage taken by the first officers at the scene to identify partygoers.
DCI Leonard said: “When they get there, we’ve got a hugely chaotic situation. People were incredibly upset and in shock.
“But the reality is nobody who was at that party has come forward to give us a statement or any further information.”
He added: “I would also urge those who were at the party to make contact and tell us what you know.
“It is vital that we gather as much information as possible to establish what happened in the early hours of that Sunday morning and why.”
Sasha’s mother, Ellet Dalling, said: “What has happened to Sasha has left us devastated. 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.”
Five males have been arrested in connection with the incident.
Deriggs will next appear at the Old Bailey on June 25.
Ms Johnson had been among 30 guests at a silent disco in the garden of a home in Consort Road when four men in dark clothing burst in through a side gate and shots were fired, investigators said.
DCI Leonard said Ms Johnson was shot in the “ensuing melee” before the suspects fled.
A second person injured only suffered a superficial wound, police said.
Ms Johnson, a mother-of-two, is a prominent member of the BLM movement and a founding member of the Taking the Initiative party which launched last year.
She graduated with a first in social care from Oxford Brookes University, and was well known for her activism in her community.
Detectives continue to appeal for anyone with information to come forward by calling police on 101 or Crimestoppers, anonymously, on 0800 555 111 and providing the reference 1172/23MAY.