over here but isis finds a way to circumvent that to pop up elsewhere. >> and the cyber authorities are playing catch-up. isis has this jihadi help desk, this 24-hour hot line you can call in to get technical guidance on how to spread a virus. they say, for example, blackberry messenger is moderately secure. don't use the app used by facebook which is less secure. but a game of catch and they have a long way to go. >> for more on isis and the intelligence agencies that are tracking those involved with the paris attacks, i'm joined by david lowe a former counterterrorism officer and tara maler, a fellow in the international security program at new america and former cia military analyst. david, let me start with you. how credible are these new isis threats, these videos that have come out trying to intimidate the people of rome and new york?