new york. >> good to be here. >> what do you have to tell us in the aftermath of this? is there a heightened sense of danger? are you seeing threats proliferate? >> no, we haven't seen an increase in threats, but our operating assumption is we are always at risk. we're a city that obviously had two horrific attacks here in 1993 and 2001. we have had 16 plots against the city since then. so, we are on alert all the time. we see no resource but to be on alert. >> i noticed most of the plots that you talked about, the 16 that you thwarted, they were against big symbolic targets often. what happened here in boston was an event. is that a difference that is meaningful? >> well, all terrorism is theater. this event was a major event certainly in the life of boston.