I'm not so sure a war will start over this. According to an Arab Journalist, Osama Bin Laden was definitely responsible for this. Most likely a whole lot of bombs will be dropped, and special forces will come into play, but I don't see a widespread deployment of US Forces against a country, because there really isn't a single country we can hold responsible for this.
BTW, anyone in MD hear anything more about Camp David? A fellow marine that I went to high school with is stationed there.