since 2011, it's been six as far as the count. how about the other four were they high ranking operatives? >> reporter: what they'll tell you, we don't know about farouq but -- we to know he was not specifically targeted. only one of those six of specifically targeted. and that's anwar al awlaki, the american who had some role in the underwear bomber case. his son was killed, 16 years old, not a big deal. another one of those who was killed again inadvertently was a fighter who had been indicted twice in plots involving u.s. target. and sami kahn killed with awlaki was author and editor of "inspire" magazine which is -- provides a lot of recipes for attacks.