Total numbers of civilian casualties in Ukraine remain unclear with no comprehensive figures released by Ukraine’s government. Early Friday, Ukraine’s president, Volodymyr Zelensky, said at least 137 people — civilians and military personnel — had been killed in the Russian attacks.

But Russia is facing growing accusations that its barrages are hitting civilian areas, and the tally of Ukrainians killed or injured could climb sharply as Russian forces push into Kyiv and other major cities, many now surrounded by Russian forces.

Russian Foreign Minister Sergey Lavrov claimed Friday that “no strikes are being made on civilian infrastructure.”

But across the country, Ukrainians are huddled in bunkers and basements as the Russian advance into Ukraine deepens. Under international humanitarian law, warring parties are required to be able to justify their targets and avoid civilian infrastructure. Intentionally targeting civilian infrastructure can be factors in possible war crime charges.