KHARKIV, Ukraine—A Russian airstrike is believed to have killed some 60 villagers who had taken refuge in a school in Ukraine’s Luhansk region, authorities there said, while embattled Ukrainian forces making a last stand in Mariupol vowed to fight till the end if they aren’t rescued.

The airstrike, late Saturday in the village of Bilohorivka, hit a school and a nearby concert hall, causing a fire. By the time the fire was extinguished hours later, rescuers had pulled out 30 survivors and found two bodies, while some 60 others who remain under the rubble are presumed dead, said Luhansk Gov. Serhiy Haidai.

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