WASHINGTON — Documents released by the F.B.I. on Friday revealed new details about the Justice Department’s yearlong investigation into Hillary Clinton’s use of a private email server and whether she and her aides mishandled classified information. Among the documents was an 11-page summary of an interview F.B.I. agents conducted with Mrs. Clinton on July 2. Two days later, the F.B.I. director, James B. Comey, said the bureau had recommended to the Justice Department that neither Mrs. Clinton nor her aides should be charged with a crime. Here are six highlights from those documents:

New details about the deletion of Mrs. Clinton’s emails

According to the F.B.I., in December 2014 a top aide to Mrs. Clinton told the company that housed her server to delete an archive of emails from her account. The company, Platte River Networks, apparently never followed those instructions. On March 2, 2015, The New York Times reported that Mrs. Clinton had exclusively used a personal email account when she was secretary of state. Two days later, the congressional committee investigating the 2012 attacks in Benghazi, Libya, and Mrs. Clinton’s response to them, told the technology firms associated with the email account that they had to retain “all relevant documents” related to its inquiry.

Three weeks later, a Platte River employee realized he had not deleted the emails as instructed. The employee said he then used a special program called BleachBit to delete the files. The F.B.I. said Mrs. Clinton was unaware of the deletions.

The F.B.I. said it was later able to find some of the emails, but did not say how many emails were deleted, or whether they were included in the 60,000 emails that Mrs. Clinton said she sent and received while secretary of state from 2009 to 2013.