I wouldn't take this too seriously. From what I've seen, most of the threats terrorist organizations put out there amount to nothing. And, in all
honesty, would they really go through the time, effort, and danger of planning an attack only to be willing to call it all off if the French give in
to their demands? I'm calling a bluff on this one.
While the Eiffel Tower is an important landmark, I think they would pick a target that will contain a lot more people than at the Eiffel Tower. I just
hope the French take this as a serious threat and do everything they possibly can to put a stop to any tragedies there before anyone loses their life.
While I doubt they would advertise the exact city they are planning to attack, the threat itself should be taken seriously. I would hate for another
9/11 to happen anywhere.