now after identifying him as a british citizen ininebruary. >> a a's stephanie ramos i ilive in washingngn. stephanie, w wl the u.s. ever have 100% confirmation that he's deadadnd how will they try to confirm it? >> reporter: well, reena, u.s. officials say this morning they presume jihadi john was killed by that u.s. drone strike based on what they observed in the hit and say his car was struck and it virtually burst into flames. they may never have 100% confirmation, but they can come close by listening to the social media. >> okay, so clearly he is an hvt or a high value target but could this be a turning poinin the fight against isis? >> reporter: well, it will certainly give isis leaders pause about how effective the u.s. was in tracking this top target. now, here's a big question. could the u.s. be after other top targets? well, richard clarke, a former counterterrorism adviser to the white house and current abc news consultant, says this might be a a big blow to the terror...