As images of the bodies emerged from Bucha, European leaders condemned the atrocities and called for tougher sanctions against Moscow.
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Ukrainian officials said the bodies of 410 civilians were found in Kyiv-area towns that were recently retaken from Russian forces.
Residents in the Philadelphia region are reacting to the horrifying images.
"What happened in Bucha is just the ultimate, to date, sign of the level of devastation," said Gene Luciw, president of the Philadelphia Branch of Ukrainian Congress Committee. "We are outraged. I've been polite, but I think it's time that the Western world take this seriously because we are defending the world."
Those who escaped the war are recounting the horrors they lived through.
Two refugees arrived in Philadelphia last week. They walked nearly 450 miles from the Ukrainian capital of Kyiv to Warsaw, Poland to find safety.
"Many people were trying to escape from Mariupol," said refugee Alla Pukhtetska. "This peaceful city was destroyed absolutely and people were trying to save their lives underground."
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Their arrival was made possible through visas issued by the U.S. Embassy in Warsaw, and more refugees are expected in the coming weeks.
"We still remain in nervous condition," said Pukhtetska.
Luciw said the best thing people can do to help Ukrainians is to contact their local politicians and ask for the U.S. to further support Ukraine.
The Associated Press and ABC News contributed to this report.