Three suspects were arrested in Malmö in southern Sweden and four more suspects were detained in Stockholm County on suspicions of human trafficking and aggravated pimping.
The police said in a statement that the case involves a number of women who were subjected to human trafficking for sexual purposes during 2008 and 2009.
A police spokesperson from Skåne in southern Sweden told the TT news agency that police don’t plan on releasing any more details about the case at this time.
“We’ll say more when we feel that we can do so,” Bo Lundquist of the Skåne police told news agency TT.
The investigation against the suspects, who allegedly recruited their victims from west Africa, has been ongoing since the spring.
The seven arrests took place through cooperative efforts between police in Skåne, Stockholm, and the National Criminal Investigation Department (Rikskriminalpolisen).
Law enforcement authorities and organizations in other countries were also involved in the investigation.
The seven suspects will face a remand hearing at the end of the week.
Police also said they may arrest more people in the case.