The parents of the Minnesota college student identified as a person of interest in the disappearance of University of Pittsburgh student Sudiksha Konanki said their son has been detained “under irregular conditions” – as sources said authorities in the Dominican Republic pledged to intensify interrogations.

Interpol has issued a global alert for Sudiksha Konanki, the Pitt student who went missing while on spring break in the Dominican Republic. The Yellow Notice for Konanki comes as officials released more details about the search on Thursday,