iraq. stunning news. the willingness of the government to accept new american air strikes. they are battling for a day after taking over. half a million people have fled the fighting, which is also reporting civilian casualties with hospitals being rendered. jim sciutto has the report. >> reporter: this is iraq 11 years after the u.s. invasion, 3 years after the u.s. withdrawal and now in a state of crisis. after capturing iraq's second largest city, militants are boldly pushing on. taking over saddam hussein's hometown, the oil refining town and nearing the capital of baghdad. iraqi security forces following