Blame Leaks Probe Is Gathering Momentum

Administration and CIA officials said they have seen signs in the past few weeks that the investigation continues intensively behind closed doors, even though little about the investigation has been publicly said or seen for months.

The Justice Department has added a fourth prosecutor to the team investigating the leak of an undercover CIA officer's identity, while the FBI has said a grand jury may be called to take testimony from administration officials, sources close to the case said.