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

Authorities in Dominican Republic have revoked the passport of the man they have named as a person of interest in the case of missing University of Pittsburgh student Sudiksha Konanki. Officials there are continuing to question Joshua Riibe about the whereabouts of Konanki.

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,