Updated - 22 November 14:57 p.m., GMT
Detectives from the Metropolitan police Human Trafficking Unit have rescued a 69-year-old Malaysian woman, a 57-year-old Irish woman and a 30-year-old British woman from a house in Lambeth after receiving reports that they had been kept as domestic slaves for up to thirty years.
A man and a woman, both 67, were arrested "as part of an investigation into slavery and domestic servitude," the city's Metropolitan Police said in a statement. Neither of them are British.
The BBC is reporting that the suspects have had prior run-ins with the police.
The police moved after they were contacted by Freedom Charity, which works to solve issues around "forced marriage and dishonour based violence."
Speaking on Sky News, Aneeta Prem from the Freedom Charity said it was difficult for the woman to make the call because she'd been "institutionalised". She said "You're looking at domestic slavery and you wouldn't expect that to be happening in London in 2013."
She said it was "an ordinary house in an ordinary street...they had rooms but they were restricted in what they could do. They weren't able to leave the property at all...There were lots of tears and lots of hugging [in the call centre] when they were freed."
The woman apparently contacted the charity after seeing Prem on television. All three had been rescued on 25th October and it was the arrest of the the man and woman who had been living in the house that prompted the announcement. The youngest of the three has apparently had no contact whatsoever with the outside world.