The case of missing Indian-origin student Sudiksha Konanki continues to unravel. The last person to see the 20-year-old, who disappeared in the Dominican Republic, was Joshua Riibe. Authorities have declared the 22-year-old man a ‘person of interest’ and confiscated his passport;

The passport of Joshua Riibes, an American linked to the disappearance of a University of Pittsburgh student, has been confiscated by Dominican authorities as part of an ongoing investigation, his attorneys told NBC News.

Joshua Riibe was the last person seen with University of Pittsburgh student Sudiksha Konanki before she went missing while in the Dominican Republic. His attorney said his passport has been confiscated by Dominican authorities and he is confined to a hotel.

The search for a U.S. college student who went missing in the Dominican Republic intensified on Monday after a man questioned by authorities visited the beach where she was last seen and spoke with officials.

The last person authorities believe may have seen Sudiksha Konanki, the 20-year-old University of Pittsburgh student who vanished while on a spring break trip in the Dominican Republic, was back on the beach — this time with investigators.