so, terrorism is in play: let s bring in catherine herridge from washington our correspondent who knows all of the intel players. so what are you hearing tonight, catherine? well, bill, we have have just had a conversation with u.s. government official who has told us that the lead assailant has been confirmed as a u.s. citizen. they did not provide further information but they did also tell us that they had been working with a foreign name earlier and they believe, basissed on based on their review of records that that name has washed out. what caught my attention of the news conference is description of male and female suspect that were killed at that suv. the assault style clothing, the assault weapons. a handguns, and then also what they believe may be explosive devices inside that vehicle and then also at a suspect s home. a final point the fbi as the east coast has progressed and you rightly point out is becoming more deeply involved in this investigation and halsz not ruled