welcome back. we're live in baghdad. the campaign that's being carried out by militants here in iraq is being advertised online by this group isis on jihadi internet forums, on facebook, on twitter. the images that are emerging are frankly horrifying, some purporting to show the, cushions of iraqi security forces and others, mass executions. in a moment i'll speak with peter bergen and former see and fbi official phillip mudd on what isis is trying to accomplish but we want to warn you that the images coming up may be too graphic for some young viewers. howard damon reports. >> reporter: two of the captains have border guard patches on their sleeves. the guard tells them to repeat "islamic state here today." the first two comply, fear on their faces. the third struggles to formulate the words. moments later, this. . he appears to be dehydrated,