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in the town of bucha, which is northwest of the capital, these are images showing the bodies of civilians, and a cnn crew was taken to a mass grave that the mayor said may contain up to 300 bodies. outraged western leaders accusing russia of war crimes. they are now calling for investigations and escalating sanctions. more now from cnn's fred pleitgen who is on the ground in 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 saying 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 believed up to 150 civilians might be buried here, but no one knows the exact number. people killed while the russian army occupied this town.