The former president of the University of Oklahoma, David L. Boren, is being investigated over allegations that he made unwanted sexual advances toward a student from 2010 through 2012, according to officials and a news report.

The allegations against Mr. Boren, 77, who was once the state’s governor and a United States senator, surfaced in November, and the university sought the help of the Atlanta law firm Jones Day to investigate, a university spokeswoman said.

Separately, the Oklahoma State Bureau of Investigation was asked on Thursday by the university police to help in the investigation of Mr. Boren and James Hall, a former vice president for development at the university, a bureau spokeswoman said on Friday.

Mr. Boren could not be reached for comment on Friday night. His lawyer said he denied the allegations. Mr. Hall could not be reached on Friday night; he has denied any wrongdoing.