Among the unknowns:

•Why were the revisions made?

•Why did Secretary of State Hillary Rodham Clinton testify before Congress that the edits were a product of the intelligence community when State officials had made many of the requests for alterations?

•Why did the White House say it made no substantive edits when the e-mails show officials there helped lead the process for changes?

•Where did the story come from that the attack grew from a protest against an anti-Islam video? The video was mentioned once in 100 pages of e-mails, but it was a central theme of Obama’s and Clinton’s description of the event.