we can't get there to find out what is going on for ourselves. that's key this evening. we don't know how the fight is going. is isis on the verge of pushing through getting closer to baghdad? we just can't find out. >> arwa, one of the things that you and nick have both been emphasizing in your reporting is this is not just isis fighters. there are also other groups involved here, sunni militant groups. talk about that a little bit what you're seeing on the ground. >> well, anderson, this is one of the main reasons why isis has been able to make this dramatic advance towards the capital baghdad, and that is that it is not fighting on its own. it has the support of the sunni tribes, and it does also for the time being at least have the support of those sunni insurgent groups that were so prominent and so successful during the u.s.-led occupation of iraq. at this point, even though they do not share the same ideology in that these sunni groups do not want to see an islamic