(CNN)Multiple U.S. officials tell CNN none of the individuals identified so far in the Paris attacks have been on any U.S. watch-lists, raising new questions about how effectively the U.S. and its allies are able to track foreign fighters traveling to Syria and Iraq. U.S. intelligence analysts have also been combing through signal intelligence, including email and other communications, and have turned up no communications among the attackers. This is partly why U.S. investigators are increasingly convinced the attackers used encrypted communications to evade French intelligence. One U.S. official described it as an "educated presumption," which is also based partly on the fact that some of...
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