Ukrainian authorities have found at least one mass burial site near Izyum, the recaptured north-eastern city previously occupied by Russian forces.
Hundreds of graves have been found in a forest marked with crudely made wooden crosses, most of them only with numbers.
A larger grave bore a marker saying it contained the bodies of 17 Ukrainian soldiers.
Sergei Bolvinov, a senior investigator for Ukrainian police in the eastern Kharkiv region, told Sky News that a pit containing more than 440 bodies was discovered near Izyum after Kyiv's forces swept in.
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