FBI says it is investigating more email "pertinent" to Clinton server (Update: Weiner alert)

FBI Director James Comey writes in a letter sent Friday to congress that the bureau is investigating more emails related to Hillary Clinton's use of a personal email server.

In previous congressional testimony, I referred to the fact that the Federal Bureau of Investigation (FBI) had completed its investigation of former Secretary Clinton's personal email server. Due to recent developments, I am writing to supplement my previous testimony

In connection with an unrelated case, the FBI has learned of the existence of emails that appear to be pertinent to the investigation. I am writing to inform you that the investigative team briefed me on this yesterday, and I agreed that the FBI should take appropriate investigative steps designed to allow investigators to review these emails to determine whether they contain classified information, as well as to assess their importance to our investigation.

Although the FBI cannot yet assess whether or not this material may be significant, and I cannot predict how long it will take us to complete this additional work, I believe it is important to update your Committees about our efforts in light of my previous testimony.

The letter's vague. Everyone is losing their shit over it, either thinking it's saying more than it is (there's no suggestion that it's her email), or finding its lack of detail suggestive of a partisan effort to spread fear and doubt days before an election.

The earlier investigation led to Comey announcing that Clinton's use of personal email was inappropriate but not worthy of charges.

UPDATE: Get this: it's apparently got something to do with Anthony Weiner's teen sext stuff.

Federal law enforcement officials said Friday that the new emails uncovered in the closed investigation into Hillary Clinton’s use of a private email server were discovered after the F.B.I. seized electronic devices belonging to Huma Abedin, a top aide to Mrs. Clinton, and her husband, Anthony Weiner.

The F.B.I. is investigating illicit text messages that Mr. Weiner sent to a 15-year-old girl in North Carolina.

The implication is that Huma Abedin's device has email to or from Hillary on it, and therefore vanishingly unlikely to make a difference to anything.

Here's Newsweek on why Comey might have been forced to turn this into an October surprise.

UPDATE: Looks like a dead dud.