The FBI found about 30 emails involving Hillary Clinton that are potentially related to the Benghazi terrorist attack as part of its investigation of the former secretary of state's use of a private email server, the State Department said Tuesday.

Of these emails, "an undetermined number" were not among the 55,000 emails Clinton provided to the State Department, the Associated Press reports:

Government lawyers told U.S. District Court Judge Amit P. Mehta Tuesday that an undetermined number of the emails among the 30 were not included in the 55,000 pages previously provided by Clinton. The State Department's lawyer said it would need until the end of September to review the emails and redact potentially classified information before they are released. Mehta questioned why it would take so long to release so few documents, and urged that the process be sped up. He ordered the department to report to him in a week with more details about why the review process would take a full month.

Read more from the AP here.