Four people have been arrested in connection with the disappearance of Lee Boxell, who has been missing for 26 years.
North Cheam teenager Lee was 15 when he went missing in 1988. His body has never been found despite extensive investigations.
This morning detectives arrested three men and a woman.
A 78-year-old man and a 52-year-old man have been arrested on suspicion of murder, conspiracy to pervert the course of justice and indecency with children.
A 42-year-old woman was arrested on suspicion of conspiracy to pervert the course of justice and indecency with children and a 41-year-old man has been arrested on suspicion of murder and conspiracy to pervert the course of justice.
They have been taken into custody at central London police stations.
Lee, who would be 41 now, was last seen in Sutton town centre in Sutton High Street in September 1988.
Police investigations into his disappearance centred on a group of paedophiles known to operate at an informal youth club known as the Shed in the grounds of St Dunstan's Church in Cheam.