On 28 October 2016, Utah representative Jason Chaffetz sent a tweet saying that the Federal Bureau of Investigation would be reopening the investigation into Hillary Clinton’s e-mails:

FBI Dir just informed me, “The FBI has learned of the existence of emails that appear to be pertinent to the investigation.” Case reopened — Jason Chaffetz (@jasoninthehouse) October 28, 2016

WikiLeaks, which published more than 20 sets of Clinton campaign e-mails in October 2016 (in a dump known as “The Podesta Emails”) tweeted a copy of a letter dated 28 October 2016 and signed by FBI Director James Comey:

FBI has just told Congress that it is reopening the Clinton email case #FBIFriday pic.twitter.com/T7ejbkwfgD — WikiLeaks (@wikileaks) October 28, 2016

Aside from the letter and Chaffetz’s tweet, little was initially known about the impetus for the reinvestigation. There was some quibbling over whether the investigation was being “reopened” or restarted:

Clarifying: Comey doesn’t say the FBI is reopening the Clinton investigation per se, rather that it’s assessing newly found emails. — Shane Harris (@shaneharris) October 28, 2016

According to the Wall Street Journal, the new information came from electronic devices taken from Clinton aide Huma Abedin and her husband, Anthony Weiner, in the course of a separate investigation: