. >> narrator: the most prominent of those killed was an afghan elder called zabet amanullah. us officials have confirmed to frontline that he was the target. but many are convinced he was innocent. >> he was living openly. he was working on the campaign quite open, staying with people. he was on the media a lot. and everyone from the governor down were asking, "why did they kill him?" >> narrator: no one from jsoc would talk to frontline on camera, so frontline correspondent stephen grey raised the case with general petraeus. >> can i just ask you how that operation came into being? what made you think that this was the man you were targeting? >> well, we didn't think, in this case, with respect. we knew. we had days and days of what's called "the unblinking eye," confirmed by other forms of intelligence, that informed us that this... there is no question about who this individual was. >> the man who was killed, who appears to be the target, was living openly in kabul. we have afghan government officials who say this man was innocent. so what gives you confidence that he was