Photo of Week 6 of Russia's invasion of Ukraine : The Picture Show Ukraine has launched an investigation into war crimes officials believe have been committed by Russian forces during the course of the invasion.

Photos: Carnage at eastern Ukraine train station, where Russian strike killed 50

Editor's Note: Some of the images in this story are graphic.

April 7: A woman surveys the damage to her home in the outskirts of Ivankiv, in northern Ukraine. Sergei Supinsky/AFP via Getty Images hide caption

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Sergei Supinsky/AFP via Getty Images

April 7: A woman surveys the damage to her home in the outskirts of Ivankiv, in northern Ukraine.

Sergei Supinsky/AFP via Getty Images

Russian troops are leaving scenes of devastation — flattened apartment buildings, mass graves and bodies lying in the streets — as they leave the area around Kyiv.

Millions are displaced, either finding refuge in Western countries, like Poland, Slovakia, Hungary, Romania and Moldova, or shelters in cities where the situation is less dire, like Lviv.

Here is what it looks like on the ground in Ukraine:

April 8: A fragment of a Tochka-U missile lies on the ground following an attack on a railway station in Kramatorsk, in eastern Ukraine. A missile hit the crowded station that was serving as an evacuation point for civilians fleeing the war. Officials said Friday 50 people had been killed — five of them children — and nearly 100 more were injured in the strike. Andriy Andriyenko/AP hide caption

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Andriy Andriyenko/AP

April 7: Oksana Gavrielutca, 41, (from left) sits at the back of a bus with her children Oleg, 18, Diana, 17, and Vlad, 5, after they fled from the village of Snigiriovka, in southern Ukraine. Petros Giannakouris/AP hide caption

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Petros Giannakouris/AP

April 7: Rescue workers remove rubble from a residential area in Borodianka, near Kyiv. The Russian retreat from towns near Kyiv revealed scores of civilian deaths and the full extent of devastation from Russia's failed attempt to seize the capital. Anastasia Vlasova/Getty Images hide caption

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Anastasia Vlasova/Getty Images

April 8: Cars sit in front of a train station damaged by Russian shelling in Kramatorsk, in eastern Ukraine. Andriy Andriyenko/AP hide caption

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Andriy Andriyenko/AP

April 7: A woman is helped onto a train near Severodonetsk, as she tries to flee the country's Donbas region. Fadel Senna/AFP via Getty Images hide caption

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Fadel Senna/AFP via Getty Images

April 7: A destroyed tank sits in a yard in Chernihiv, in northern Ukraine. Evgeniy Maloletka/AP hide caption

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Evgeniy Maloletka/AP

April 8: Bodies are covered in plastic sheets after an explosion killed at least 50 people at a train station in Kramatorsk, in eastern Ukraine. The site was the center of civilian evacuation efforts the government called for ahead of anticipated aggression by Russia in the area. Fadel Senna/AFP via Getty Images hide caption

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Fadel Senna/AFP via Getty Images

April 8: A man hugs a woman after Russian shelling at the railway station in Kramatorsk. Andriy Andriyenko/AP hide caption

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Andriy Andriyenko/AP

April 7: People walk bicycles past apartment buildings destroyed by shelling in Chernihiv, in northern Ukraine. Evgeniy Maloletka/AP hide caption

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Evgeniy Maloletka/AP

April 7: Smoke rises near the city of Severodonetsk, in the country's Donbas region, as the Russian military's invasion continues. Fadel Senna/AFP via Getty Images hide caption

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Fadel Senna/AFP via Getty Images

April 7: Cemetery workers unload the bodies of civilians killed in and around Bucha, on the outskirts of Kyiv, before they're transported to the morgue. Chris McGrath/Getty Images hide caption

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Chris McGrath/Getty Images

April 8: A Ukrainian police officer reacts to the carnage at the site of an attack that killed at least 50 people at a crowded train station in Kramatorsk, in eastern Ukraine, that was the center of civilian evacuations in the region. Fadel Senna/AFP via Getty Images hide caption

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Fadel Senna/AFP via Getty Images

April 8: A Ukrainian police officer reacts to the carnage at the site of an attack that killed at least 50 people at a crowded train station in Kramatorsk, in eastern Ukraine, that was the center of civilian evacuations in the region.

Fadel Senna/AFP via Getty Images

April 6: Ukrainian soldiers walk next to heavily damaged residential buildings in Irpin, on the outskirts of Kyiv. Felipe Dana/AP hide caption

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Felipe Dana/AP

April 6: Ukrainian soldiers walk next to heavily damaged residential buildings in Irpin, on the outskirts of Kyiv.

Felipe Dana/AP

April 6: A young girl and her dog arrive at a center for internally displaced persons in Zaporizhzhia, some 124 miles northwest of Mariupol. Bulent Kilic/AFP via Getty Images hide caption

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Bulent Kilic/AFP via Getty Images

April 6: A shelled home burns in Severodonetsk, in the Donbas region in eastern Ukraine, as Ukrainian officials urge residents in the east to evacuate or "risk death" ahead of a feared ramping up of Russian activity in the area, which Moscow has declared its top prize. Fadel Senna/AFP via Getty Images hide caption

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Fadel Senna/AFP via Getty Images

April 6: A cat sits between large caliber rounds of ammunition abandoned by retreating Russian forces or retrieved from destroyed fighting vehicles in the village of Andriivka, in eastern Ukraine. Vadim Ghirda/AP hide caption

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Vadim Ghirda/AP

April 6: A man pushes his bike through debris and destroyed Russian military vehicles on a street in Bucha, where the Ukrainian government has accused Russian forces of committing a "deliberate massacre." Chris McGrath/Getty Images hide caption

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Chris McGrath/Getty Images

April 6: Yurii, 41, who serves in the Ukrainian military, stands in his apartment in Hostomel, on the outskirts of Kyiv, as he gathers things to take with him. The suburb of Ukraine's capital city was occupied for more than a month by Russian forces until they retreated to Belarus last week. Alexey Furman/Getty Images hide caption

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Alexey Furman/Getty Images

April 6: Children look at the sandbags that cover the windows at the Smart English pre-school in Lviv, in western Ukraine. The sandbags were put in place to help lessen the potential impact of an air strike amid Russia's ongoing invasion. Joe Raedle/Getty Images hide caption

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Joe Raedle/Getty Images

April 6: A police officer stands behind the body of a civilian allegedly shot by Russian forces on a road in Bucha, on the outskirts of Kyiv. Chris McGrath/Getty Images hide caption

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Chris McGrath/Getty Images

April 7: A boy holds a loaf of bread he received as part of humanitarian aid being handed out in front of a school in Chernihiv, in northern Ukraine. Evgeniy Maloletka/AP hide caption

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Evgeniy Maloletka/AP

April 6: A residential building in the town of Borodianka, northwest of Kyiv, was destroyed in Russia's invasion. Nicolas Garcia/AFP via Getty Images hide caption

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Nicolas Garcia/AFP via Getty Images

April 6: Cemetery workers load the corpses of civilians killed in Bucha, on the outskirts of Kyiv, to be transported to the morgue. Rodrigo Abd/AP hide caption

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Rodrigo Abd/AP

April 6: Motria Oleksiienko, 99, traumatized by the Russian occupation, is comforted by daughter-in-law Tetiana Oleksiienko in a room without heat in the village of Andriivka, in eastern Ukraine. Vadim Ghirda/AP hide caption

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Vadim Ghirda/AP