Information in at least one email sent to former Secretary of State Hillary Clinton's private email account has now been classified, reports The Associated Press.

The email was forwarded to Clinton by her deputy chief of staff Jake Sullivan on Nov. 18, 2012, and discusses reports of arrests in Libya of possible suspects in the deadly Sept. 11, 2012 attack on the U.S. consulate in Benghazi.

The information in the email was not classified at the time it was sent, but was upgraded from "unclassified" to "secret" on Friday following a request from the FBI, officials at the State Department said, according to AP.

On Friday, the State Department released 296 emails totaling 896 pages from Clinton's tenure as secretary of state, in the first batch to be made public. The emails show internal communications regarding the Benghazi attacks. The department said that 23 words from the Nov. 18 message were redacted to protect foreign relations. No other redactions were made to the first batch, officials said.

AP notes that while no laws were violated since the email was not classified at the time it was sent, the revelation does show that Clinton received sensitive information on her unsecured private email server. Security experts and top intelligence officials have said the information found on that server almost certainly wound up in the hands of spies and/or hackers.

State Department officials are still reviewing 55,000 additional pages of email correspondence from the private email account Clinton used during her tenure, which will be published on a rolling basis.