BUCHA, Ukraine—More than 100 civilians lay buried in mass graves in this suburb of Kyiv after Russian troops withdrew last week, one of several regions in which Ukrainian officials and independent rights watchdogs say they are uncovering evidence of war crimes perpetrated by occupation forces.

When the Russian military forces abandoned Bucha, it left streets littered with bodies of civilians. Human Rights Watch on Sunday released a report documenting instances of rape and summary executions in Russian-occupied parts of Ukraine, including Bucha, as well as other alleged crimes.

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