State Department headquarters in D.C., left, and, right, Hillary Rodham Clinton speaks to the reporters at United Nations headquarters on Tuesday, March 10, 2015.
"In a press conference this week, FBI Director James Comey made clear that former Secretary of State Hillary Clinton and her staff were "extremely careless" and clearly mishandled highly-classified information that could have compromised our national security", said Rounds.
Kirby set no deadline for the investigation's completion.
The department first started its investigation in January after more than 20 emails containing "top secret" information were discovered on Clinton's private email server located inside her NY home. The State Department will decide if employees managing Clinton's emails should be subject to disciplinary action, which could mean getting reprimands or loss of security clearance.
The department will more than likely investigate Cheryl Mills, Jake Sullivan, and Huma Abedin, Clinton's closest aides.
"The department will look into whether Clinton's emails were classified as top-secret when they were sent, reported the AP".
The reopening of the probe is expected, since investigation needed to wait for the Justice Department to complete its criminal investigation.
Sanctions leveled against her aides would also be a useful tool in the hands of Clinton's hardline right-wing Republican enemies.
Kirby did not give details about the precise information officials were evaluating.
In May, the department's Inspector General released a scathing report that said the State Department "did not - and would not - approve [Clinton's] exclusive reliance on a personal e-mail account to conduct Department business". House Oversight Committee chairman Rep. Jason Chaffetz (R-Utah) said Thursday that Congress would be making a referral to the FBI to investigate whether Clinton perjured herself during testimony in which she claimed she had not sent or received any classified e-mails from her private mail server account.
Outlining his agency's findings at a news conference, Federal Bureau of Investigation director James Comey concluded that "no charges are appropriate" despite "extremely careless" behaviour by Mrs Clinton and her staff. The AP said the State Department declared 22 emails from her private server to be "top secret".
So, it appears the State Department will, eventually, have some "consequences" to show Chaffetz.