captured, paraded and shot in cold blood. mass killing unseen in iraq since the days of saddam hussein. cnn cannot independently confirm the authenticity of these images. tonight the president is convening his national security team to review options for a u.s. response. u.s. mesa verde arrived in the persian gulf to help with possible evacuation of americans joining the carrier george h.w. bush. secretary kerry acknowledged airstrikes on iraqi targets are now under consideration. >> when you have people murdering, assassinating, in these mass massacres, you have to stop that and you do what you need do if you need to stop it from the air or otherwise. >> with or without military action, a political compromise brings iraqi sunnis and kurds