71.   But investigators were not devoid of clues.

72.   But investigators were unable to find out his identity until they set up the in-person meeting at the airport.

73.   But privately, some officials said that investigators were at the fledgling stage of the inquiry and had no idea what they would find.

74.   But since then, Democratic Party investigators have been unable to find some of the people whose names are on those checks.

75.   But some U.S. investigators are frustrated that the inquiry, which the Egyptian government delegated to the United States, has not been completed.

76.   But she left for France Wednesday evening without seeing him because the Justice Department required that an FBI investigator be present during their meeting and their session tape recorded.

77.   But some investigators are dubious that the plane could have climbed a mile and a half, and suggested that the interpretation of the radar data was wrong.

78.   But now postal investigators are not so sure.

79.   But the Cox analysis found that police investigators are three times more likely to cite car drivers for driving errors that contributed to an accident.

80.   But the investigators were reluctant to reveal details, for fear of jeopardizing the ongoing investigations.