blowing up targets in coney island shooting police they pretty well have to move very fast. they could easily pick up guns and turn to action quickly. so it s all a question of timing. right. this investigation, we do know started over the summer. it s been ongoing for more than six months. what is that threshold for law enforcement to take action? i think i would suspect and we haven t seen this for sure, that they had a source close to these people and once they actually talked about once they had been turned away or couldn t get to syria, at that point they were probably considering making attacks in the united states and the fbi moved very quickly. it s always a balancing act for the fbi. do you let the investigation run on for years or move quickly. the fbi has gotten very good at it. but what worries them though is the lone wolf who doesn t go up on the internet doesn t go