Officials say the Obama administration has discovered a chain of emails 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.

The revelation adds to the growing questions related to the Democratic presidential front-runner’s unusual usage of a private email account and server while in government.

The messages were exchanged with former top Gen. David Petraeus, beginning before Clinton entered office and continuing into her first days on the job.

Officials said they largely pertained to personnel matters and in no way dealt with classified material. But their existence challenges Clinton’s claim that she has handed over the entirety of her work emails from the account.

(AP)