network, in turn linked to the paris attacks. i think that's the precise part of it. the imprecise part of it is they clearly don't know where these individuals are, otherwise you can bet they wouldn't put this alert out because they wouldn't want to tip them off they're about to be arrested. they clearly do not have a handle on where these people are. that, of course, makes them much more concerned there. stepping up security at airports in geneva, all the international organizations. clearly a lot of concern all over europe in the wake of the paris attacks. we could see more of that style of terrorism play out on the street of terrorism, kate. >> from france to belgium now to switzerland. paul chu was the marriage between the two shooters specific for terror? that's one thing the fbi director, james comey, addressed on capitol hill yesterday.