international air space and fired on a u.s. air force predator drone, an unmanned drone in international air space that the pentagon insists conducting routine all toe classified maritime surveillance. the iranian air force hit the drone. the drone was able to return to base in that region. but this does raise some serious new tensions with iran. it was, of course, just a few days before the presidential election. here in the united states. officials that we have talked to confirming it after we questioned them say they just don t know at this point what the iranians were up to. just out to cause trouble or trying to bring down that u.s. drone, brooke. this is clearly raising tensions as you point out. could this be considered an act of war? reporter: well, it s an interesting question for the pentagon lawyers. the thing is, you know, they fired the u.s. believes we re told in an unprovoked fashion. they say that the drone was in international air space about 16 miles off