Images showed dead bodies lining the streets of Bucha, a suburb of Kyiv, as Russian forces retreated in the north of Ukraine. Russia has denied responsibility.
The extent of the devastation in the suburbs of Ukraine's capital Kyiv was revealed as Russian forces retreat in the north of Ukraine.
Images showed dead bodies and burned-out tanks lining streets in the town of Bucha outside the capital, with Ukrainian officials denouncing a "deliberate massacre" of civilians
Journalists who travelled to the city confirmed that they saw bodies in civilian clothes that appeared to be killed at close range.
Russian forces have retreated in the north but officials have warned that they will likely shift their focus to Ukraine's south and east.
EU Council President Charles Michel tweeted that he was "shocked" by the images of "atrocities committed by the Russian army" in the suburbs of Kyiv. He promised further sanctions in reaction.
Millions of people are internally displaced or have fled Ukraine since Russia invaded on 24 February. Officials now say Russia could focus its effort in the south and east of the country as it retreats in the north.