Who was on the ground taking pictures of it all that night? There are professional looking photos of the building and a vehicle on fire, etc.
I don’t know. My guess would be that since it was CNN that found Stevens’ diary, it might have been them. Possibly al jazeera or the news guys from Lebanon who first announced that Stevens had been raped. Could have been Libyan press.
It could have been ansar al shariah itself since they do so love to film themselves in action and upload it straight to youtube.