into one of the most horrific events of the war in ukraine so far. on march 9th, a russian air strike hit this maternity hospital in mariupol, killing at least five people and leaving more than a dozen injured. much of the world was shocked by the sheer brutality of that strike. russia said the attack was legitimate because ukrainian troops it said had allegedly overtaken the civilian facility. cnn looked into this incident using modeling technology, satellite images, and witness account as katie polglase reports, there isn't a shred of evidence to support these russian' allegations. >> reporter: kharkiv. melitopol. now, mariupol. despite being an apparent war crime, medical facilities have been repeatedly hit by russia