The couple accused of holding three women as slaves for more than 30 years have been linked to 13 addresses across London, it was reported.
The three alleged victims – a 30-year-old Briton, a 57-year-old Irishwoman and a 69-year-old Malaysian – are believed to have suffered years of "physical and mental abuse" at the hands of the couple, both 67.
Police carried out inquiries over the weekend in and around Peckford Place, Brixton, south London, where the three women were found.
The number of properties associated with the couple, who came to the UK in the 1960s, suggests the women may have been moved around London repeatedly over the last three decades, it was reported.
Yesterday British Home Secretary Theresa May said tackling modern slavery in Britain was a "personal priority".
Police have recovered a birth certificate for the 30-year-old woman, who is believed to have lived her entire life in servitude.
The case came to light after the Irish woman rang the Freedom Charity last month to say she had been held against her will.