Even as an investigation into the case is underway, police in the Caribbean country have been interrogating one person -- ...

Sudiksha Konanki had arrived in the Caribbean for spring break and was last seen on the morning of March 6 with Joshua Riibe.

On March 13, Loudoun County Sheriff's Office named Riibe as a 'person of interest' in the case. Authorities said Riibe is not considered a suspect but 'he may have been the last one to see her'. The ...