of these syrian rebels. katherine is live in our dc newsroom. >> the video shows a group of rebel commanders that was posted on a pro syrian regime website. you can see the black and white islamist flag. three analysts reviewed this tape for fox news. >> the narrative is jihady. the narrative they are talking about is the use of weapons they have not used before. what comes to mind is chemical or biological. >> this man was also identified to fox news as a deputy to general idris. this is the leader of the free army some call moderate. this week the administration pressed for answers. >> it seems like initially the opposition was maybe more western leaning, more democratic. and as the time has gone by it degraded and has become more infiltrated by al-qaeda. is that true? >> that is basically not true. that is basically incorrect. the opposition has increasingly become more defined by its moderation.