Ukrainian authorities were investigating possible war crimes by Russia after finding hundreds of bodies, some bound and shot at close range, strewn around towns near Kyiv after Kremlin forces withdrew to refocus their attacks in other parts of the country.

In the town of Bucha, 37km northwest of Kyiv's city centre, Reuters reporters saw a man lay sprawled by the roadside, his hands tied behind his back and a bullet wound to his head.

Bucha's deputy mayor, Taras Shapravskyi, said 50 of some 300 bodies, found after Russian forces withdrew...