the entire building where all those civilians perished. that's why there will be an investigation to figure out exactly what happened there. booby trap, car bomb, what happened. let's go live to erbil, iraq and bring in our correspondent. she was just in mosul, just giving us a walk through of some of those streets. the president's assessment that things are going well. how is that sitting there? >> reporter: look it's all relative. when you look at it purely from a military perspective, when you look at it purely from are the iraqi security forces with the u.s. backed coalition, pushing forward gaining territory from isis yes things are going well. but that's a bit of an over simplification of what's a complicated situation. nobody thought the battle nor result would be easy. it's one of the toughest battles in modern history because iraqis