vitac -- www.vitac.com the following is a cnn special report. it all happened within a few minutes. in the street, the cafes, at the game and the concert. but could what happened in paris happen in the u.s.? >> i don't know of a time when we've been beset by more threats. >> al qaeda and isis, lurking beyond america's reach. >> tracking isis movements today in iraq and syria. >> that's a tough problem.