Four people have been arrested as part of an operation targeting human trafficking in Northern Ireland.
Detectives from the PSNI made the arrests after carrying out four searches - three in Ballymena and one in Omagh - on Tuesday.
The operation focuses on the activities of an organised crime group suspected of trafficking Romanian women for the purpose of sexual exploitation.
Detective Inspector Rachel Miskelly said they believe the women travelled to Northern Ireland with the promise of a better life.
"Three men, aged 27, 31 and 52, and a 21-year-old woman were each arrested on suspicion of human trafficking for sexual exploitation, controlling prostitution for gain, brothel keeping and money laundering," she said.
"All four remain in custody at this time.
"We believe the organised crime group coaxed Romanian women to travel to Northern Ireland with the false promise of a better quality of life.
"The shocking reality is that, upon arrival, the women have been forced into prostitution and exploited."
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Detective Inspector Miskelly said one woman has so far been identified and offered safeguarding with others "yet to be identified".
She said other victims have likely been moved to other areas.
"Whilst the brothels linked to this group were located in Ballymena and Omagh, we believe that victims may have been transported to various locations throughout the country for the purpose of sexual exploitation," she said.
“Unfortunately, we suspect there are more victims yet to be identified and our investigation will continue," she added.
The PSNI is appealing for anyone who may have information to come forward.