was an area that isis had been pushed out. >> reporter: differenting accounts of what happened on the outskirts of baghdad. it is, according to isis, quite a complex operation. enabling chaos around and inside. and then liberate. -- differing figures from officials saying perhaps a riot triggered unrest and allowed the jailbreak. we don't know exact numbers. there are clearly dead in this and at least i think it is fair to say 40 inmates who escaped. nine according to officials were facing terrorism offenses. we don't know who they were. what level of significance they have in the isis hierarchy but obviously significant enough for isis to seek to use this level of resources to try to liberate