Oct. 28 (Bloomberg) -- I. Lewis Libby, Vice President Richard Cheney's top aide, lied to FBI agents and a grand jury about his discussions with reporters regarding a CIA agent who is married to a critic of the Iraq war, special counsel Patrick Fitzgerald said.

The investigation is ``not over,'' Fitzgerald said at a news conference in Washington. He didn't elaborate and refused to comment on whether the grand jury was still looking into the role played by Karl Rove, President George W. Bush's deputy chief of staff and top political adviser.

Libby, who was indicted today on five counts including perjury and obstruction of justice, told investigators ``a compelling story'' that he learned about the CIA connection of Valerie Plame Wilson from reporters, the prosecutor said. That was contradicted by other witnesses and documents, which showed Libby had numerous earlier discussion's about the agent and her husband, former diplomat Joseph Wilson, Fitzgerald said.

``He lied about it afterward, under oath and repeatedly,'' Fitzgerald said.

The prosecutor has been probing the disclosure of the Central Intelligence Agency operative's identity for 22 months after the CIA referred a complaint to Justice alleging White House officials may have violated a 1982 law designed to protect the identity of covert agents.

The case expanded in recent months to examine whether administration officials gave false statements, obstructed justice or committed perjury, according to witnesses who have testified before the panel and attorney familiar with the case. Rove has testified before the panel on four occasions.

White House spokesman Scott McClellan told reporters traveling with Bush this morning to Norfolk, Virginia, for a speech on the campaign against terrorism, the White House would ``probably have more to say.'' later today.

Rove's attorney, Robert Luskin, said Rove ``will continue to cooperate fully'' with the investigation.

``We are confident that when the special counsel finishes his work, he will conclude that Mr. Rove has done nothing wrong,'' Luskin said in a statement earlier today.

To contact the reporter on this story: William McQuillen in Washington at bmcquillen@bloomberg.net; William Roberts in Washington at wroberts@bloomberg.net

Last Updated: October 28, 2005 14:39 EDT