our solidarity with them, we will defeat these terrorists. after 9/11, we had similar incidents. after the boston marathon attacks. this is very typical. nerves are frayed. people are very jittery, on edge and just trying to adjust to what, unfortunately, i think, is becoming a new normal. >> sean, you also have to remember that in regards to paris and back in january, the charlie hebdo attack, there was the grocery store attack, and that did come -- it was a legitimate attack that came in the waves afterwards. how vulnerable is paris overall to a second wave of attacks? >> i think they are very vulnerable, right? europe is different from the united states in a couple of ways. one is the geographical boundaries. two is the concentration of radicalized muslims that exist in certain parts of the country. you've already seen listenings to belgium. a certain part of belgium where not only did the train attacker