WASHINGTON (CNN) -- Special Counsel Patrick Fitzgerald said he will have to bring more information before a new grand jury in the CIA leak probe, adding that his work is not complete.In a new court filing, Fitzgerald said sensitive information from his investigation still needs to be protected, especially since proceedings will involve a different jury than the one that indicted former Lewis Libby, chief of staff for Vice President Dick Cheney. The panel hearing that part of the inquiry expired that day.Fitzgerald does not say that new charges definitely will be brought. Instead, the filing discusses what rules govern disclosure of information to the media regarding evidence in the case against Libby.Libby faces five charges, including obstruction of justice, perjury and making false statements. He resigned his position on Cheney's staff October 28, the same day he was indicted.For the last two years, Fitzgerald has been investigating the leaking of the identity of CIA operative Valerie Plame to the media. On Monday, Washington Post journalist Bob Woodward gave a sworn deposition to Fitzgerald about three Bush administration officials he interviewed for his 2004 book on the run-up to the Iraq war, "Plan of Attack." One of those sources identified Plame, the wife of former U.S. ambassador Joseph Wilson, as a weapons of mass destruction analyst for the CIA, Woodward said. (Full story)Wilson wrote an opinion piece in July 2003 in the New York Times that accused the Bush administration of "exaggerating the Iraqi threat" in order to justify war. Shortly after that, his wife's role with the CIA was revealed publicly.Woodward's revelation of his involvement has only deepened the mystery of the person behind the leak.