Authorities in the Dominican Republic have confiscated the passport of the man who is the last person known to have been with missing University of Pittsburgh student Sudiksha Konanki, according to a source close to the investigation. Since Konanki first went missing in the early hours of March 6, Riibe, a 22-year-old from Rock Rapids, Iowa, and a senior at St. Cloud State University in Minnesota, has remained under police surveillance in the Dominican Republic. He has been taken to the police station for interrogation multiple times, his parents said in a statement.