ground to extremists there maybe more troops from iraq heading in there. terry moran has more from iraq. >> ferocious fighting in northern iraq. iraqi soldiers desperately trying to hold off the jihadist onslaught sweeping down toward baghdad but the iraqi troops are losing. these incredible scenes posted on you-tube by the militants show thousands of iraqi soldiers who surrendered and are now prisoners, the militants claimed. they have wracked up victory after victory. vast territory, major cities falling under this black flag an these fighters threaten baghdad, 11 years after u.s. troops toppled saddam hussein. all of that is now crumbling. the triumphant fighters from the islamic state of iraq and syria, as they are called, isis. a track record of brutality, executions, mass beheadings, massacres. even al qaeda disavowed them. their goal, a new nation straddling two countries and pure islam as they define it,