president biden is now calling for a war crimes trial against vladimir putin because of this. let s begin our coverage with cnn s fred pleitgen. he filed this report on the very latest from bucha. reporter: as russian forces retreat from the area north of kyiv in their wake, scenes of utter destruction. whole blocks of houses flattened, ukrainian authorities say they believe dead bodies are still lying underneath. but here, the dead also lay in the open. ukrainian national police showed us this mass grave in bucha saying they believe up to 150 civilians might be buried here but no one knows the exact number. people killed while the russian army occupied this town. this is what it looks like when the hope is crushed. vladimir searching for his younger brother demetri and now convinced he lies here, even though he can t be 100% sure.
vladimir searching for his younger brother dmitri and convinced he lies here, even though he can t be 100% sure. the neighbor accompanying him with strong words for the russians. translator: why do you hate us so much? you just want to destroy us. you want us gone. we will be okay. everything will be okay. i believe it. reporter: video from bucha shows bodies in the streets after russian forces left the area. some images even show bodies with hands tied behind their backs. the russian defense ministry denies killing civilians and claims images of dead civilians are fake. but we met a family just returning to their house in this town which they say was oured by russian soldiers. they show us the body of a dead man in civilian clothes they had found in the backyard.