The authorities have interviewed a man who may have been the last person to see a University of Pittsburgh student before she disappeared last week while on spring break in the Dominican Republic, an American official said.

The Dominican National Police said in a statement that the student, Sudiksha Konanki, 20, of Loudoun County, Va., was last seen early Thursday when she went to the beach in Punta Cana with an unnamed friend who was “under investigation.”

Chad Quinn, a spokesman for the Loudoun County Sheriff’s Office, said on Wednesday that the man, who may have been the last to see Ms. Konanki, is believed to be an American citizen who was vacationing in Punta Cana, but was not part of the group of friends traveling with Ms. Konanki.

The New York Times is not identifying the man because he has not been charged with a crime.

He is “a person of interest in a missing-person investigation,” Mr. Quinn said in an email. “This is not at this time a criminal investigation. So to be clear,66cassino he is not a suspect.”

Mr. Quinn added that the man, who he did not believe was in custody, had spoken to the Dominican authorities “a couple of times.”

Thomas Julia, another spokesman for the Sheriff’s Office, said that some of the people who were on the beach with Ms. Konanki were intoxicated. “Nobody can vouch for what exactly happened to her,” Mr. Julia said.

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Among the most prominent names were the former defense secretaries Chuck Hagel, a Republican who served under President Barack Obama; William Cohen, a Republican who served under President Bill Clinton; and William J. Perry, a Democrat who served under Mr. Clinton.

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