iraqi forces battle isis for control. taking place as american trained iraqi units are under scrutiny for brutality. abc's brian ross has details. >> reporter: this video shows two unarmed iraqi civilians pleading for their lives, begging not isis but the very forces the u.s. is counting on to stop isis. the video slowed down, shows men with u.s. supplied weapons. this freeze-frame catches a soldier with insignia of the iraqi special forces. they watch the but do not stop as two villagers are killed and then the gunmen opened fire on the pile of body. the disturbing video is one of dozens of such images discovered by abc news on social media sites connected to elite units of the iraqi army and the militias who fight alongside them. >> what we are seeing here is a brazen, proud, display of the terrible crimes. >> reporter: in this video of a prisoner being tortured u.s. supplied weapons can be seen in the background. other images show men in what appear to be iraqi army uniforms celebrating right after a civilian has been beheaded. >> this is the uniform of the iraqi special forces now.