you look at 9/11 tis so much easier to secure an airport since everyone has to deputy through the same entrance. there is surveillance and you have the metal detention. and we have been able to secure the airports and the attacks on the streets with the vehicles. you can put up barriers and there are so many areas people are ought in the open and they are talking about christmas shopping and people coming back and forth to church. not a planned event. those are relatively easy to secure. you can have sanitation truck and secure that area. and every day congress when people walk up down the streets. it is knowing and try to learn in advance what is going to happen. bill: we had a reporter in times square and think about the massive amount of public spaces