Authorities have been searching by land, air and sea for a University of Pittsburgh student who disappeared last week while on spring break in the popular Dominican Republic resort of Punta Cana.

The National Police said in a statement Sunday that the student, Sudiksha Konanki, 20, was last seen early Thursday when she went to the beach by the Hotel Riu Republica with an unnamed friend who has been “under investigation.”

Konanki, a resident of Loudoun County, Virginia, had been staying at the hotel with five friends after arriving in the Dominican Republic on March 3, police said.

When the United States Embassy in the Dominican Republic alerted the national police Friday morning that Konanki had disappeared, officials began an exhaustive search, authorities said. Investigators have established that Konanki disappeared sometime after 4:15 a.m. Thursday, when she and other young people she was with were seen on surveillance video near the beach entrance, police said.

— The New York Times