The teenage victim of a fatal stabbing in east London has been named as Daniel Laskos.
Officers were also called shortly after 6.50pm to reports of another stabbing on the nearby Retford Road.
A second boy aged 15 was found suffering from a stab wound and was taken to an east London hospital where he remains, though his condition is not life threatening.
He has been arrested on suspicion of murder, police said.
A 17-year-old boy who suffered a stab injury was also admitted to an east London hospital, where he remains, and has been arrested on suspicion of murder. A 16-year-old boy was arrested at the scene on suspicion of affray.
Three more males have been arrested in relation to the case, aged 24, 20, and 18.
Homicide detectives from the Met’s Specialist Crime Command are investigating and enquiries remain ongoing.
Anyone with information that could assist the investigation is asked to call police on 101 or tweet @MetCC and quote reference CAD 6572/07May.
Alternatively, to remain anonymous contact the independent charity Crimestoppers on 0800 555 111.