Don't be too confident that it can't happen here. Our own officials have said that we can't protect everything 24/7. We already have terrorist cells in the USA. Our "borders" are extremely porous -- all the illegals here are proof of that.
Of course it can happen here and in France as well. According to a Newsweek article last year, "The Hunt for Bin Laden", should OBL's capture be imminent his three sons have orders to kill him. This will cause him to be seen as a martyr in the eyes of the radical Islamic world with possible major terrorist attacks in France and the USA. France has by far one of the largest Muslim populations in Europe (which is not to say that every Muslim is a radical but all it takes is a handful).