© PA Police want residents of Dolphin Square to come forwards
Scotland Yard is investigating the alleged murder of three young boys linked to a Westminster paedophile ring active in the late seventies and early eighties.
Detectives have appealed for abuse victims and potential witnesses to come forward to assist them in their probe into the historic sex gang, which is codenamed Operation Midland.
Appealing for witnesses, the man leading the inquiry said people who lived or visited Dolphin Square in Pimlico, central London, in the 1970s "will have seen or heard something that they only understand the significance of now".
The residential development near Parliament has long been popular with MPs.
Cyril Smith, the late Liberal MP, was among the senior politicians named in a 40-page dossier detailing alleged child abusers within the British Establishment sent to then Home Secretary Leon Brittan in November 1983.
Police are also investigating allegations that abuse took place at other premises across London and the Home Counties, including some military bases.
© PA Cyril Smith was among the senior politicians named in a dossier detailing alleged child abusers within the British Establishment
Detective Superintendent Kenny McDonald, the lead officer for the operation, said: "I appeal to men who were subjected to abuse 30 years ago to come forward.
"We are also investigating the murder of three young boys - we are determined to find answers."
Deputy Assistant Commissioner Steve Rodhouse said an alleged victim, called Nick - not his real name - had claimed he was abused at a flat in Dolphin Square between 1975 and 1984.
Mr McDonald said: "Nick has been spoken to by experienced officers from the child abuse team and from the murder investigation team and they and I believe what Nick is saying is credible and true, hence why we are investigating the allegations that he has made."
"Nick" has alleged he was abused by single men, groups of men and at "parties", and that other young boys were present who were also abused, Mr McDonald added.
No further details of the alleged murders were given by detectives.
Mr Rodhouse said: "We are committed to fully investigating these cases and we will go where the evidence takes us and we will act without fear or favour."
Last month, the father of an eight-year-old boy murdered 33 years ago claimed his son may have been killed by the paedophile ring.
Vishambar Mehrotra, a 69-year-old retired magistrate, recorded a male prostitute saying in a telephone call that his son Vishal may have been abducted and taken to the Elm Guest House in Barnes, south-west London, in 1981.
Mr Mehrotra took the recording to the Metropolitan Police at the time but told The Telegraph they refused to investigate an allegation implicating "judges and politicians".