Authorities are searching in the tourist town of Punta Cana for any signs of 20-year-old Pitt student Sudiksha Konanki, who disappeared while on spring break.
Iowan Joshua Steven Riibe told prosecutors he and Sudiksha Konanki were hit by an intense wave and were swept out to sea.
The Loudoun County Sheriff's Office in Virginia said U.S. investigators interviewed a person of interest at length.