Leahy said he was informed immediately about the discovery by FBI Director Robert Mueller.
On Monday, FBI Director Robert Mueller insisted the agency had "no warning signs" of last week's attacks.
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The FBI investigated, but found no evidence of extremist activity, FBI Director Robert Mueller told a Senate committee.
Former Attorney General John Ashcroft and current FBI Director Robert Mueller were among those personally sued.
According to FBI director Robert Mueller federal law enforcement agencies continue to uncover major fraud, insider trading and Ponzi schemes.
Leahy said FBI Director Robert Mueller informed him immediately about the discovery, noting that his staffers said they felt fine.
Robert Mueller, the director of the Federal Bureau of Investigation, originally feared there would be large amounts of stimulus fraud.
The Intelligence Committee leaders met Thursday with FBI Director Robert Mueller, whose agency is investigating the leaks, according to legislators.
U.S. Attorney General Eric Holder spoke with FBI Director Robert Mueller and U.S. Attorney Carmen Ortiz, a Justice Department official said.
The FBI investigated, but found no evidence of extremist activity, FBI Director Robert Mueller reiterated Thursday during a Senate Appropriations Committee hearing.
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Mr Obama has tasked FBI director Robert Mueller with overseeing the investigation.
Secretary of State Condoleezza Rice, FBI Director Robert Mueller, members of the House of Representatives and Senate, and other dignitaries also took part.
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The official also pointed to a strong, long-standing relationship between Holder and FBI Director Robert Mueller, who is expected to remain in that post.
"There were no warning signs that I'm aware of that would indicate this type of operation in the country, " FBI Director Robert Mueller said Monday.
The technology overhaul has been a priority for FBI Director Robert Mueller since the Sept. 11, 2001, attacks exposed the bureau's troubles with information sharing.
In a letter to Congress last week, FBI Director Robert Mueller said "sequestration will require immediate and significant reductions" to the agency and its operations.
This week, both FBI Director Robert Mueller and Mr. Kerry, the secretary of state, traveled to Moscow to press the Russian government for more help.
The announcement by the FBI came just prior to a meeting the agencys chief, Robert Mueller, promised to make changes that would position the FBI to better combat terrorism.
Earlier in the day, the president met with FBI Director Robert Mueller, Attorney General Eric Holder and Secretary of Homeland Security Janet Napolitano, an administration official said.
In April last year, Scotland's Lord Advocate Frank Mulholland travelled to Tripoli with the director of the FBI, Robert Mueller, requesting co-operation after the fall of Gaddafi.
Senators were informed of the letter at a closed-door briefing by FBI Director Robert Mueller and Homeland Security Secretary Janet Napolitano about the Boston Marathon bombings, the aide added.
Federal Bureau of Investigation Director Robert Mueller said the charges would include the attack on Ms. Giffords and Judge Roll and other victims, with later additional charges likely.
Robert Mueller was originally nominated by President George W. Bush as FBI Director on July 5, 2001 and was unanimously confirmed by the United States Senate on August 2, 2001.
Mr. ROBERT MUELLER (Director, FBI): You know, a lot of judges, when they come in and they handle a matter, they like to think they're the smartest person in the room.
Today, FBI director robert Mueller told told the U.S. House Permanent Select Committee on Intelligence that cyber crime could be a bigger concern for the bureau than terrorism in the future.
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The statement's wording was very similar to that used by Ashcroft and FBI Director Robert Mueller in their midweek press conference, which had riled some Homeland Security and other law enforcement officials.
Obama will meet with FBI Director Robert Mueller, Attorney General Eric Holder, Secretary of Homeland Security Janet Napolitano, CIA Director Leon Panetta and Secretary of State Hillary Clinton, administration officials told CNN.
Last week, Senators Jon Kyl, Chuck Schumer, and Tom Coburn of the Senate Subcommittee on Terrorism, commended FBI director Robert Mueller for severing ties with an unindicted co-conspirator in the terror finance case.
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While visiting the crash site Thursday, FBI Director Robert Mueller said translators were helping to work on a transcript of the tape -- confirming that more than one language is heard on the tape.
While none of the intelligence chiefs, who included CIA Director Leon Panetta, FBI Director Robert Mueller and others, cited a specific pending threat, their testimony made clear that an evolving al Qaeda remains their top concern.
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