Six people have been arrested following raids at Westminster brothels where luxury cars, jewellery, paintings and cash worth £1 million were seized.
The Metropolitan Police said a ‘number of victims’ had been discovered during the major crackdown operation, and are being offered support by agencies including the Salvation Army.
Most of the alleged victims are Chinese, but a minority are Romanian and British nationals.
Seven addresses were raided in London on Wednesday morning, and a further residential property in Gloucestershire was searched.
The Met said the arrests were part of an investigation, called Operation Huai, into an organised crime group believed to be sexually exploiting women at brothels in Westminster.
Four women and two men, aged between 27 and 67, have been arrested on suspicion of modern slavery and money laundering.
The Met said four have been taken to a central London police station and two have been taken to a station in Gloucestershire. They all remain in custody.
Detective Superintendent Tara McGovern, of the modern slavery investigation team, said: ‘We are committed to protecting the vulnerable and bringing those responsible for exploiting others to justice.
‘I hope this investigation continues to raise the public’s awareness of this shocking crime and sends a clear message to those involved that we will take robust action.
‘The Met will continue to work with partners, including the Salvation Army, to combat human trafficking and modern slavery in order to safeguard those who are most vulnerable.
‘Even during these unprecedented times, we will continue to target organised crime groups who seek to profit from these audacious acts and bring them to justice’.