I agree with Wildcrd. They are just bidding their time. They are gonna wait till we feel all nice and safe and they will hit us again. I speculate they are going to hit schools and churches at some point.
What I dont get is why they think what they do will scare us and make us submit. They have to realize that all it does is piss us off and more of them will die. Hell if it was up to me, each one caught needs to be beaten within an inch of his/her life until they cough up the information we need to know. If they die during the process, shock their heart and bring em back. After the third time, if they make it that far, let em stay dead. They lost their right to life when they decided to be terrorist.
Sorry I'm a lil bitter about some folks and world events.