New emails the FBI is examining related to Democratic presidential candidate Hillary Clinton's use of a private computer server were discovered after the agency seized electronic devices belonging to Clinton aide Huma Abedin and her husband, Anthony Weiner, the New York Times reported on Friday, citing law enforcement officials.

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The FBI said on Friday it will investigate additional emails that have surfaced relating to Hillary Clinton's use of a private email system, in a new twist to the U.S. presidential campaign with 11 days to go before Election Day.

In a letter to several U.S. congressional committee chairmen, Federal Bureau of Investigation Director James Comey said the agency will determine whether the emails contain classified information, adding that it is unclear how significant the new materials may be.

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2 PHOTOS Hillary Clinton, Huma Abedin and Anthony Weiner sexting scandal See Gallery Hillary Clinton, Huma Abedin and Anthony Weiner sexting scandal Huma Abedin, aide to Democratic U.S. presidential candidate and former Secretary of State Hillary Clinton, points as Mrs. Clinton waves to attendees at the conclusion of the second official 2016 U.S. Democratic presidential candidates debate in Des Moines, Iowa, November 14, 2015. REUTERS/Jim Young Huma Abedin, longtime aide to Democratic U.S. presidential candidate Hillary Clinton, attends a Clinton campaign rally in Charlotte, North Carolina, U.S., July 5, 2016. REUTERS/Brian Snyder/File Photo Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

Comey said he "cannot predict how long it will take us to complete this additional work."

The announcement shook up the campaign for the Nov. 8 election, where Clinton is the Democratic Party's candidate and the front-runner in opinion polls.

The FBI spent about a year investigating Clinton's use of an unauthorized private email server for her work as U.S. secretary of state between 2009 and 2013 after it emerged that there were classified government secrets in some of her emails.

In July, the FBI characterized Clinton's handling of classified information via email as "extremely careless" but, after a months-long investigation, it recommended that no criminal charges be brought.

Comey provided no further details on Friday about the nature of the additional emails now being looked into.

"In connection with an unrelated case, the FBI has learned of the existence of emails that appear to be pertinent to the investigation," Comey wrote in the letter released on Friday.

He said that the FBI "cannot yet assess whether or not this material may be significant."

Spokespeople for Clinton did not immediately respond to a request for comment. She has previously apologized for her server, which was set up in her home in Chappaqua, New York. She said the arrangement was a mistake, and that she did not knowingly send or receive classified information.

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Friday's news was seized upon by Donald Trump, Clinton's Republican rival for the presidency, who has repeatedly sought to cite her email practices as disqualifying her for office.

"I need to open with a very critical breaking news announcement," Trump said at the start of a rally in Manchester, New Hampshire, before describing Comey's letter.

He was drowned out by a chant from the crowd: "Lock her up!"

"We must not let her take her criminal scheme into the Oval Office," Trump continued. "I have great respect for the fact that the FBI and the Department of Justice are now willing to have the courage to right the horrible mistake that they made."

Paul Ryan, the House of Representative Speaker and the most senior elected Republican in Congress, said Clinton should not get classified briefings until the investigation was over.

"Yet again, Hillary Clinton has nobody but herself to blame," he said in a statement. "She was entrusted with some of our nation's most important secrets, and she betrayed that trust by carelessly mishandling highly classified information."

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8 PHOTOS Michelle Obama campaigns for Hillary Clinton See Gallery Michelle Obama campaigns for Hillary Clinton First lady Michelle Obama (L) and U.S. Democratic presidential candidate Hillary Clinton wave after a campaign rally in Winston-Salem, North Carolina, October 27, 2016. REUTERS/Carlos Barria U.S. Democratic presidential candidate Hillary Clinton (L) arrives to a campaign rally accompanied by U.S. first lady Michelle Obama in Winston-Salem, North Carolina, U.S., October 27, 2016. REUTERS/Carlos Barria U.S. Democratic presidential candidate Hillary Clinton listens as U.S. First Lady Michelle Obama speaks during a campaign rally in Winston-Salem, North Carolina, U.S., October 27, 2016. REUTERS/Carlos Barria U.S. first lady Michelle Obama embraces U.S. Democratic presidential candidate Hillary Clinton as they arrive at a campaign rally in Winston-Salem, North Carolina, U.S., October 27, 2016. REUTERS/Carlos Barria U.S. Democratic presidential candidate Hillary Clinton arrives to a campaign rally accompanied by U.S. first lady Michelle Obama in Winston-Salem, North Carolina, U.S., October 27, 2016. REUTERS/Carlos Barria U.S. first lady Michelle Obama speaks during a campaign rally in support of U.S. Democratic presidential nominee Hillary Clinton in Winston-Salem, North Carolina, U.S., October 27, 2016. REUTERS/Carlos Barria Supporters touch U.S. first lady Michelle Obama hand after she delivers a speech during a campaign rally in support of U.S. Democratic presidential nominee Hillary Clinton in Winston-Salem, North Carolina, U.S., October 27, 2016. REUTERS/Carlos Barria U.S. Democratic presidential candidate Hillary Clinton reacts as she introduces U.S. first lady Michelle Obama during a campaign rally in Winston-Salem, North Carolina, U.S., October 27, 2016. REUTERS/Carlos Barria Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

U.S. stock prices fell along with U.S. Treasury yields at midsession on Friday after the FBI news.

The U.S. dollar slipped against major currencies such as the euro and the yen, while the Mexican peso fell to an 11-day low.

A victory for Trump has been viewed as a risk for the Mexican currency given his promises to clamp down on illegal immigration and rethink trade relations. (Additional reporting by Mark Hosenball and Julia Harte in Washington, Steve Holland in Manchester and Sam Forgione in New York; Editing by Jonathan Oatis and Alistair Bell)