Scott Pelley: What did you learn from Paris?
John Brennan: That there is a lot that ISIL probably has underway that we don't have obviously full insight into. We knew the system was blinking red. We knew just in the days before that ISIL was trying to carry out something. But the individuals involved have been able to take advantage of the newly available means of communication that are--that are walled off, from law enforcement officials.
Scott Pelley: You're talking about encrypted Internet communications.
John Brennan: Yeah, I'm talking about the very sophisticated use of these technologies and communication systems.
Scott Pelley: After Paris you told your people what?
John Brennan: We gotta work harder. We have to work harder. We need to have the capabilities, the technical capabilities, the human sources. We need to be able to have advanced notice about this so that we can take this-- the steps to stop them. Believe me, intelligence security services have stopped numerous attacks-- operatives-- that have been moved from maybe the Iraq to Syria theater into Europe. They have been stopped and interdicted and arrested and detained and debriefed because of very, very good intelligence.
I hardly need to point out that John Brennan was not referring, in that last sentence, to French intelligence.