51.   One intelligence source said there was strong circumstantial evidence that Saeed, the chief suspect in the case, had ties to the ISI.

52.   Pakistani intelligence sources saw this as a warning to the government from jihadi groups not to clamp down on them too hard.

53.   Satellite imagery has revealed that bodies may have been removed from at least two grave sites, US intelligence sources have said.

54.   Some are warranted, like information on how to make nuclear arms or the identity of American intelligence sources.

55.   The CIA has traditionally been reluctant to share secret intelligence sources with the FBI and the Justice Department, fearing the sources might be exposed during investigations and trials.

56.   The evidence for nerve-gas production is said to lie in soil samples, but it cannot be revealed because that would put intelligence sources in jeopardy.

57.   The government defends the practice as justified to protect sensitive counterterrorism intelligence sources and law enforcement efforts.

58.   The implication, intelligence sources said, was that it was Atef who was responsible for training the hijackers who went to the camps in Afghanistan.

59.   The intelligence source said that the director had advised against granting a pardon.

60.   The most specific warning that bin Laden planned an attack apparently came from Egyptian intelligence sources.