they're going to be come part mentalised. what one compartmentalized. there is going to be a preven there. whether kwlits at the subway stations, whenever. terrorists are going to go to the easiest target possible. if they see police or if there are canine teams there as well, it's not going to be an easy target and they will go some place else >>> is this something after the event. after the paris attacks, we know that one of the suspects passed through the borders easily back to belgium, was stopped by the police as well, never apprehended. clearly there have been mistakes on so many levels, haven't there. if you see what has happened today, it certainly raises questions about the security in areas that should be secure. >> i not sure i would categorise that as mistakes. this is complicated in the fact that when you have these independent cells and they know the trade to guard their communications t, they're careful what they're doing. a lot of times it's a lucky break to get them or it's detailed analysis of phone records, of emails to identify cells