related to the friday night terror attacks, isis terrorists killed 129 innocent people. all this happening as elite terror police units are conducticonduct ing anti-terror operations across france in grenoble and toulouse. toulouse, police took three people into custody. we'll bring you the latest information as soon as we confirm it and get it up to date. meanwhile, paris, itself, remains in a state of emergency. new details about the attacks, who the isis terrorists were. now u.s. officials have a new concern. did these isis terrorists go dark just before they sprung their plan on an unsuspecting people in paris? our justice correspondent, pamela brown, is in washington. she's getting new information. what can you tell us, pamela? >> wolf, i can tell you that counterterrorism officials i've been speaking with today are concerned that the paris attackers used encryption, in fact, one official i spoke to