They have identified and questioned a person of interest in the case, an American college student who was the last person seen with Konanki the morning she vanished, but it has not been deemed a criminal matter. It is currently a missing person investigation.

Konanki, a junior at the University of Pittsburgh who is from Loudoun County, Virginia, was last seen on security footage walking toward the beach around 4:15 a.m. She was with a group of young people, including five female friends and two young men, one of whom is believed to be a person of interest in the case. They had been drinking at the hotel bar.

Sudiksha Konanki, 20, from Virginia, vanished in Punta Cana. (Handout, left, and Defensa Civil Dominicana, right.)

The classmates and another man were seen returning to the hotel around 6 a.m.

Hours later another man, believed to be the person of interest, returned alone. Konanki has not been seen again.

Her friends reported her missing around 4 p.m.

Police have spent days searching the coastline with boats, dive teams and helicopters. The FBI is involved, and the sheriff from her Virginia hometown said he would be sending two detectives to assist in the investigation.

Fox News’ Audrey Conklin and Stepheny Price contributed to this report.