Police have conducted a series of warrants throughout Tuesday 21 August in Portsmouth and Havant.
The arrests are in connection with a complex and detailed investigation into criminal and sexual exploitation of teenagers in Portsmouth.
A number of victims have been identified and are being supported and safeguarded by the local authority, police and other agencies.
Portsmouth District Commander Superintendent Maggie Blyth said: “This investigation involves specialist teams across the force and it will take us some time to understand the details.
“Gathering details from victims is a delicate process and they are being supported through this. This support will be ongoing.
“We are taking a strong partnership approach to this investigation which will continue. We’d encourage anyone who thinks they may be able to help us to contact us, or if they are more comfortable a social worker, support worker someone else trusted.
“We are communicating directly within the community, anyone with concerns can also contact their local Neighbourhood Policing team.”
Nine people remain in custody:
- Two 17-year-old boys from Portsmouth
- 23-year-old man from Portsmouth
- 21-year-old man from Portsmouth
- Two 15-year-old boys from Havant
- 29-year-old man from Portsmouth
- 13-year-old boy from Portsmouth
- 14-year-old boy from Havant
Children’s Services at Portsmouth City Council have a dedicated phone number to report concerns relating to the welfare of young people in the city, 023 9243 7645.