81.   Investigators focus on likelihood the blast came from a bomb.

82.   Investigators have focused their attention in part on what role, if any, that photographers may have had in the crash by pursuing the Mercedes.

83.   Investigators are focusing on the last known tenant of the apartment, a man who vanished several weeks ago.

84.   Investigators are focusing on where the bacteria came from and who has the know-how to make the refined strain mailed to Senate Majority Leader Tom Daschle.

85.   Investigators increasingly were focusing on speed as the main factor in the crash.

86.   Investigators focused almost exclusively on a parish priest who lived at the house, even as rights activists accused them of ignoring evidence of military involvement.

87.   Investigators focused Monday on whether the plane had been de-iced before takeoff.

88.   Investigators focused on an engine that fell away from the doomed plane.

89.   Investigators focused on pedophiles who use Internet chatrooms to exchange images of children.

90.   Investigators focused their work on Trenton, New Jersey, where the letters to Daschle and NBC News anchorman Tom Brokaw were mailed.