Obviously it was a very meticulously planned operation over a long period of time. A lot of organization, sophistication, a lot of technical sophistication, complete disregard of Kenyan and Tanzanian life. Therefore it would hardly be anything local as that you would find in Kenya or Tanzania.
Since the embassy in Nairobi is right in the middle of downtown, you can't very well protect against a bomb, a car bomb, that just drives up the main road downtown and blows up. There is a similar situation in Dar es Salaam.
The groups that are doing this without the knowledge and against the will of the Pakistani government -- but they don't have the control.
They're already diverting attention and perhaps some resources from the fight against al Qaeda and the Taliban on Pakistan's western border. So the U.S. has a very big interest in this.