Washington is abuzz with speculation today about possible indictments coming down against multiple senior administration officials over the outing of covert CIA operative Valerie Plame. On Thursday, the special prosecutor heading the investigation summoned senior Bush advisor Karl Rove to appear before the grand Jury—for a rare 4th appearance. Rove appears before the Grand Jury with no offer of immunity with the prosecutor, Patrick Fitzgerald, informing Rove in writing that he could face indictment later. Meanwhile, the LA Times reports: “In Washington, talk of imminent indictments — of Rove alone or with others as part of a conspiracy — was overheard in the corridors of the FBI, Justice Department and White House.” The New York Times is reporting that prosecutor Fitzgerald will likely call on several other White House officials to return to the grand jury to testify about their actions in the case. The Grand Jury expires October 28. In addition to Rove, Fitzgerald is also reportedly re-examining grand jury testimony by Dick Cheney’s chief of staff, Lewis “Scooter” Libby.