of how the attack unfolded and tom foreman is at the virtual wall to walk us through it. >> let's take a look at the layout of this airport because as you mentioned 9:50 in the evening and that's when the taxi with the three gunmen pulled up to this entrance to the lower level here. they immediately got out and the shooting started almost immediately and that's where one of the gunmen actually set off his explosive in this area, roughly where they pulled up. we don't know why he set it off there. it is not clear yet whether he tried to get into the building and did it right off the bat and his explosion happened right in the general area and according to eyewitnesses it may have been the most powerful of the blast. second gunman, let's look where he went. he went further down the concourse here and actually broke through that security cordon there or was on the other side of it, at least, by the time he reached this portion in the middle. he's the one who made it to that arrival...