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Police will formally interview three women allegedly held as slaves for the first time today.
The trio have had indirect contact with officers but police have had to wait until trauma experts gave them the go-ahead to take their accounts in person.
Commander Steve Rodhouse said: "We have not yet been able to formally interview the victims in this case so we don't fully understand the nature of the allegations. We are moving to a point where we will be able to interview the victims and our plan is actually to do so today.
"The victims are in the care of specialists who have got great experience of dealing with people who have been subject to trauma.
"We're working to that advice of those experts as to how best to handle those victims, to support them and of course to draw out the evidence we would need to substantiate any prosecution."
ITV News believes this woman to be Aishah, the 69-year-old Malaysian woman rescued from the alleged 'slavery' house in south London.
She is pictured in a 1997 documentary about the death of Sian Davies, who died following a fall from a window of a house used by the group.
According the press reports from 1978, a 34-year-old woman called Aishe Waham was arrested following a police raid on the group's headquarters.
Press reports from 1997 quote an Aisha Wahab giving evidence at a coroners' inquest into Sian Davies' death.
A Telegraph report today says the woman was originally known as Aishah Mautum, who moved to Britain in 1968 from Malaysia before becoming involved with the Maoist group.
ITV News has uncovered documentary footage of members of the alleged 'slavery' commune in south London.
These pictures from 1997 show members of the group responding to questions about the death of group member Sian Davies, who died following a fall from a window of a house used by the group.
Members are also seen attending an inquest into the death of Sian Davies, who was paralysed following the fall.
Miss Davies' family criticised the group at the inquest and in an interview today for not telling them for several months that she was paralysed in hospital.
The family only learned of the fall when Miss Davies died in hospital.
ITV News understands that one of the alleged victims is this woman, Josephine, who is now believed to be 57 years old.
She is pictured here as part of an ITV documentary in 1997 about the death of Sian Davies, who died after a fall from the window of a house used by the group.
Press reports from 1978 say a then 22-year-old commune member, Josephine Herival, was arrested during a police raid on the group's headquarters in Brixton. Sian Davies was also arrested at the same time, according to the reports.
Josephine, pictured here, is believed to be the Irish woman mentioned in recent police reports.
ITV News has obtained the first pictures of Comrade Bala, the man arrested as part of the so-called slavery investigation in south London.
In this footage the man, whose real name is Aravindan Balakrishnan, is seen wearing a brown jacket and blue trousers as he attends the inquest into the death of commune member Sian Davies in 1997.
The house at the centre of the alleged slavery case in Peckford Place, Brixton has been boarded up by council workers.
ITV News' UK Editor Lucy Manning understands that the couple accused of holding three women as slaves for more than 30 years are Aravindan Balakrishnan, known as Comrade Bala, and his wife Comrade Chanda.
The alleged victims - a 30-year-old Briton , a 57-year-old Irish woman and a 69-year-old Malaysian - are believed to have suffered years of "physical and mental abuse" at the hands of the couple.
The youngest of the three alleged slavery victims is said to have written letters to a neighbour, telling of her life as being "like a fly trapped in a spider's web".
The woman became infatuated with neighbour Marius Feneck, 26, the Guardian said, reportedly writing him more than 500 letters in seven years.
One letter apparently tells of how she suffered "unspeakable torment" behind locked doors and windows, and of how she was terrified that her captors - "these evil criminals... who dare to call themselves 'my relatives"' - might do something to him.
The couple accused of holding three women as slaves for more than 30 years have been linked to 13 addresses across London, The Guardian reported.
The number of properties associated with the couple, of Indian and Tanzanian origin who came to the UK in the 1960s, suggests the women may have been moved around London repeatedly over the last three decades, the paper said.
Tackling modern slavery in Britain is a "personal priority", the Home Secretary has said following the discovery of three women allegedly held as slaves for at least 30 years.
Theresa May said details were still emerging in the case in Brixton, south London, but it was clear that many other victims were "hidden in plain sight" across the country.
Writing in The Sunday Telegraph, Ms May said the "one positive" of the case was that more people were aware of the issue of slavery which still has "shocking presence in modern Britain".
She wrote, "It is walking our streets, supplying shops and supermarkets, working in fields, factories or nail bars, trapped in brothels or cowering behind the curtains in an ordinary street: slavery".