On November 3rd, Reuters reported that,

FBI Director James Comey was driven in part by a fear of leaks from within his agency when he decided to tell Congress the FBI was investigating newly discovered emails related to Hillary Clinton, law enforcement sources said on Thursday.

The Huffington Post reported on November 5th that there was a whirlwind week of leaks from the FBI that appear intended to cast a shadow over Clinton.

• On Sunday, The Wall Street Journal reported that FBI investigators had looked into the Clinton Foundation and were frustrated that senior law enforcement officials and career anti-corruption prosecutors were not impressed by the results. So frustrated, it seems, that details of their investigation ended up in a news report less than 10 days before Election Day.
• The leaks continued days later. A story in the Journal on Wednesday revealed more information about the investigation.
• Fox News reported on Wednesday that FBI sources said that the Clinton Foundation case is moving toward “likely an indictment.” The story was widely refuted by other media organizations. (Fox anchor Bret Baier apologized for the report on Friday, calling it a “mistake.”)
• On Friday, Donald Trump surrogate Rudy Giuliani, who claims deep connections to the FBI, admitted that the Trump campaign knew about the FBI’s review of additional emails before Comey’s letter. “I thought it was going to be about three or four weeks ago,” he said of the FBI director’s announcement. Hours later, Giuliani backpedaled and said he knew nothing of FBI leaks.