The pounding of the besieged southern port city of Mariupol intensified Sunday and a top U.S. official expressed concern about the prospect of Russian-organized "concentration and prisoner camps" as Russia's bloody assault on Ukraine waded deeper into its fourth week.
The Mariupol city council accused the Russian military of bombing an art school where about 400 people had taken shelter. There was no immediate word on casualties at the art school, but the city council said on social media the building was destroyed and people could remain under the rubble.
A few days earlier, Russian forces bombed a theater in Mariupol where civilians took shelter. Mariupol, a strategic port on the Azov Sea, has been encircled by Russian troops for weeks, cut off from energy, food and water supplies and facing a relentless bombardment.