we did when we spoke yesterday. in terms of speculation, where is your head taking you with this investigation? >> well, piers, i keep on going back and forth. you know, i think it could be a domestic group or a psychotic. but i've been talking to people in afghanistan and analysts around washington. and they're looking at al qaeda. and the way they're explaining it is that zawahiri made a tape a couple days ago in which could have been a coded message for operatives in this country to strike. again, this is speculation analysis. in particular, he's been pushing for taking retaliation for the drone strikes in pack stab pakistan and yemen. going to his people and saying we've got to hit back at these people. when i give the signal, let's do it. they're putting two and two together. whether it equals four or not, i don't know. but they're just looking at the mass casualties, patriots day. a national holiday.