DCI Andy Partridge from the Met's Homicide and Serious Crime command tells ITV London they are still looking for witnesses to come forward to help solve the murder of Sabrina Moss.
Sabrina was shot on Kilburn High Street last Saturday while out celebrating her 24th birthday.
DCI Partridge said the Met want anyone who was in the area at the time to come forward, even if they think they only have a small amount of information - saying people "may not realise the significance of what they have seen".
Anyone with any information can call police on 101 or Crimestoppers anonymously on 0800 555 111.
More top news
Police were called to break up a "large fight" which involved a baseball bat, a man dislocating his shoulder and two people being arrested.
A vulnerable 14-year-old boy with severe autism who police say is not streetwise and has no sense of risk or danger, has gone missing.
Charlton Athletic have apologised to the family of a former player after the wrong image appeared during a tribute.