Four people arrested in connection with the murder of teenager Hani Abou El Kheir have been released on bail.
Hani, 16, was stabbed to death on January 27 in Pimlico, central London, by a group of people believed to have been wielding knives and swords.
Last night one man aged 48, a woman of 47 and two girls aged 16 and 17, who were arrested on Saturday on suspicion of assisting an offender were bailed to a date in March, Scotland Yard said.
Two men aged 18 and 19 and two boys aged 16 and 17 arrested on suspicion of murder on Saturday remain in custody at police stations in east London.
Police believe at least 10 youths were involved in Hani's killing, and are keeping an open murder regarding a motive for his murder.
Detectives are appealing for anyone with information to come forward and contact the incident room on 020 8345 3715 or Crimestoppers on 0800 555 111.