standoff that the restaurant where people ran in. we don't know for sure if there were ever gunshots, although people say they heard them and we don't know what happened at the police barricade. as we go deep in the night, there in spain, many, many, many questions unanswered. all we know is terrorist have strucked in the most dreadful way. >> terrible indeed. for that, let's bring our chief national security correspondent. jim is also working the story for us. you have new reporting on isis's presence in barcelona. >> that's right. this is coming from the head of the global terrorism center in spain. formerly with the superior ministry there. going back more than a decade. he says that there have been previous arrests of isis operatives in barcelona, one earlier this year that was widely reported in april, but also in 2015, some 13 isis operatives arrested in spain, several of them in barcelona, disrupting a plot targeting