A week on from the murder of teenager Hani Abou El Kheir, police are urging people to come forward with information.
16-year-old Hani was stabbed to death last Sunday in Pimlico, central London, in an attack by a group of people believed to have been wielding knives and swords.
Today detectives will return to Lupus Street, one of London's most affluent suburbs, to redouble their efforts in the hunt for his killers.
Last night a further 8 people were arrested in connection with Hani's death.
Four males are being held on suspicion of murder and one male and three females on suspicion of assisting an offender.
The arrests last night bring the total number arrested to nine. On Thursday a 20-year-old man was arrested in north London on suspicion of murder and bailed until late March.
Witnesses or anyone with information is asked to contact the incident room on 020 8345 3715 or Crimestoppers on 0800 555 111.