large concentrations of innocent civilians. that s been they re usually attacking a government building or something along those lines. equally irrational but as far as the signature type, al qaeda is more associated with attacking iconic event which this was, attacking an athletic event which this was and also whether it be carnage to innocent civilians for the shock effect. apart from those who suffered so badly the shock effect it has on the country and general and the city of boston in particular. and also we have had al qaeda in the arabian peninsula through inspire magazine calling for attacks on athletic events. congressman, thanks very much for your analysis. but i just want to point out to all our reviewers the fbi, the governor, the mayor, the police chief in boston, they are saying it is in its infancy. we don t know. there are no hard clues yet but we appreciate your analysis of what is going on.