The FBI is reviewing additional emails related to Hillary Clinton's use of a private email server.
FBI Director James Comey announced the news Friday in letter to federal lawmakers.
"In connection with an unrelated case, the FBI has learned of the existence of emails that appear pertinent to the investigation," he said. "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."
The New York Times reports that the emails were found during the FBI's investigation into former Congressman Anthony Weiner's sexting scandal. Weiner's wife, Huma Abedin, is a top Clinton aide.
In July, the FBI recommended no charges be filed against Clinton in the case over her use of a private email server when she was Secretary of State.
The news that the FBI is now investigating new Clinton emails comes 11 days before the November 8 presidential election.
Clinton's campaign manager John D. Podesta released a statement Friday saying, "Director Comey's letter refers to emails that have come to light in an unrelated case, but we have no idea what those emails are and the director himself notes they may not even be significant.
"It is extraordinary that we would see something like this just 11 days out from a presidential election," he added.
After the news broke, Trump campaign manager Kellyanne Conway tweeted: "A great day in our campaign just got even better."