iranian fighter jet targeted an unarmed american predator drone over the persian gulf this week. when you hear the story, i heard this before, the answer is, yes. it's the latest attempt by iran to stop american intelligence gathering efforts. barbara star broke the story. how worrisome is this incident? >> it's very worrisome. to the pentagon, the cia, and the white house. when this incident happened earlier this week, we learned something very interesting. now armed fighter jets are escorting drones on the spy missions. in this incident, a fighter jet warned the iranians to stay away. cockpit to cockpit communications but it just underscores the real hair trigger for the possibility of hostilities in the persian gulf. >> can you only imagination if that communication led to the downing of one of the jets. it's a terrifying situation to imagine. we've had several of these incidents. you know, they said they have