Every expert and pundit I heard yesterday
Among them, Richard Clarke.
Thinking about a large coordintaed attack is scary but also slightly comforting.
After all, how many large groups could there be? We'd have a higher prospect of infiltration or leaks prior to an event, more clues afterwards.
We think of the attacks as one and done money shots.
One person acting alone, maybe even two, is a much scarier deal.
They'd be much more difficult to detect and there could be more shots to come....