Joshua Riibe's return to the U.S. remains unclear as there was no immediate decision about returning his passport, which authorities confiscated last week.

Joshua Steven Riibe, a 22-year-old Iowa resident and a student at St Cloud State University in Minnesota, said that the authorities detained him without any formal charges, adding he was treated unfairly during the investigation.

The last person to see University of Pittsburgh student Sudiksha Konanki before she disappeared in the Dominican Republic has had his passport taken by investigators. Authorities in the Caribbean country have confiscated Joshua Riibe’s travel documents as they continue to probe Konanki’s disappearance,