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 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;

Joshua Riibe, the person of interest, 'is permanently escorted by the police anywhere he goes,' the law firm working with him said, adding he is 'not free to leave' the resort.

The 20-year-old University of Pittsburgh student has been missing since March 6, and Joshua Riibe, the last person to see her, was named a person of interest—find out more about him here.

The Rock Rapids native has been labeled a person of interest in Sudiksha's disappearance but has not been charged or officially named a suspect.