Is this what happened at the Boston Marathon?
It's possible that the Boston Marathon had a dual situation. There may have been a training exercise going on juxtaposed with an unexpected real event. Or did someone use the training drill and turn it into a real one with criminal intent? Questions remain somewhat unanswered and the rumors are flying:
What happened and why at that Boston Marathon remains a mystery but it seems Americans will find our government out now. There will be costs but you can be sure they will be found out:
http://www.balaamsassspeaks.blogspot.com/2013/04/first-believable-terrorist-attack-on.html