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.

Monday marks 11 days since Sudiksha Konanki, a University of Pittsburgh student, disappeared while on a spring break trip to the Dominican Republic, prompting a widespread search from both U.S. and local authorities by land,

The Loudoun County Sheriff's Office in Virginia said U.S. investigators interviewed a person of interest at length.