WASHINGTON — The Obama administration has discovered a chain of e-mails that Hillary Rodham Clinton failed to turn over when she provided what she said was the full record of work-related correspondence as secretary of state, officials told The Associated Press Friday, adding to the growing questions related to her usage of a private e-mail account and server while in government.

The messages were exchanged with retired Gen. David Petraeus when he headed the military’s U.S. Central Command, responsible for running the wars in Iraq and Afghanistan. They began before Clinton entered office and continued into her first days at the State Department. They largely pertained to personnel matters, officials said.