The meek-looking young man in a T-shirt appeared in a photo on Twitter yesterday (pictured) holding an assault rifle in front of the Black Standard flag of ISIS. Last night counter-terrorism experts were trying to identify the fighter, amid speculation that the photo could be a sophisticated fake. Some Twitter users claimed he was British or Australian, while there were unconfirmed comments that the youthful jihadi's name is Jonathan Edwards. In a further twist, the image also seems to have first appeared online around the start of December. But if genuine, the recruitment of a young, white man could be viewed as a major coup for the terrorist group.