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.

Officials seized the passport of Joshua Riibe, an American college senior, and they say they are examining possible inconsistencies in his story.

Joshua Riibe's family said their son is cooperating with police and is "deeply dismayed" by Sudiksha Konanki's disappearance.