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That these terrorists are using, i know the fbi director has told me he's very concerned about this ability to avoid any kind of survey. it looks like this was a coordinated event, with a lot of communication. is it your sense based on what you know they were using these encrypted apps? >> well, i don't know that. but certainly that is something making following these groups more difficult. we look to where isis is attempting to call for a terrorist attack. it does make it difficult when those become encrypted. even when they're not, we can only follow people so much. we can only go to the end...

Fight against terrorism and extremism. >> reporter: we hear the president of the united states speaking, the president of france calling this an act of war. when you hear the words "war," people think perhaps it is not just air strikes. it certainly is not just going to be more air strikes. sell this something where we could see -- is this something where we could see a coalition force, american ground troops in syria? >> reporter: i don't think you're going to see american troops. what general allen was telling me the other day was as the u.s. and its partners get concerned about groups poppi...

Threat was under control. >> from the start, our goal has been to first contain, and we have contained them. >> reporter: administration officials explain the president was talking about isis territory in iraq and syria, not the gr p groups' influence elsewhere. with isis calling for attacks worldwide and affiliates springing up throughout the middle east, the terror group's global expansion is a major concern. just this week, obama's point man on isis, general john allen, warned of the threat of the group, also called daesh, in an interview with cnn. >> the one area where obviously we are ver...

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