A third teenager has been arrested in connection with the murder of a 19-year-old.
Nicholas Clarke was shot in the head
The 15-year-old boy, and a man aged 26, have been held in connection with the killing of Nicholas Clarke.
He was shot in the head in Brixton, south London on 14 March and died in hospital the following day.
The 15-year-old was arrested on Tuesday and remains in custody. Two other youths, aged 16 and 17, arrested on Friday have been released on bail.
The 26-year-old man was arrested in Essex on Monday and has also been released on bail.