british and americans have been saying picking up on chatter and the fact that isis claim that they did it and all indicators look like it was a bomb at this point. >> what is the role of the fbi? it been called in now. >> the fbi has a vast amount of experience in analyzing -- or doing pos one of the great assets the fbi can bring to bear is the terrorist explosive detection center. the fbi has been analyzing them, cataloguing this many and in many cases can tell the type of device that was used, where it was manufactured and in some devices, is there a concern --