The clip, filmed just after dawn on 11 September, shows four tall and western-looking men in the heat of a battle against Islamic State militants in northern Iraq. "These are the Americans," says Peshawa in a secretive tone.
One is crouched behind a machine gun firing round after round from the top of a fortified mound; another lies on his front a few feet away, legs outstretched and taking aim at the enemy with a long rifle. A third wields a long-lens camera taking photo after photo, and the last stands back, apparently overseeing the others during the combat south-west of the city of Kirkuk.