Updated 12:55 p.m.
FBI Director James Comey has notified members of Congress that the FBI has reopened its investigation into the handling of classified information in connection with Democratic presidential candidate Hillary Clinton's use of a private email server while secretary of state.
In a letter to the leaders of congressional oversight committees, Comey wrote: "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."
He added: "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."
Earlier this year, Comey closed the yearlong investigation without filing any charges against Clinton and her associates.