sentence1: But we know that at 10:31, General Larry Arnold instructed his staff to broadcast the following over a NORAD instant messaging  10:31 Vice president has cleared to us to intercept tracks of interest and shoot them down if they do not respond per [General Arnold].
sentence2: General Larry Arnold told his staff to broadcast over a NORAD messaging service at 10:31 that the Vice president had authorized the shooting down of hijacked planes and true is true .