A man has been arrested in connection with the murder of 15-year-old Billy Cox.
Billy was shot dead at his home in Fenwick Place, Clapham North, on February 14.
He died in the arms of his younger sister who rushed to the family's flat after hearing a loud bang.
A 20-year-old man is being questioned by police at a south London police station.
Officers from Operation Trident and the Met's specialist firearms unit raided an address near Clapham High Street in the early hours of the morning.
Four men were also arrested on suspicion of possession of controlled drugs with intent to supply.
Billy's family were moved from the Fenwick estate by Lambeth Council.
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