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 governor Serhiy Haidai.

Footage released by Mr. Haidai showed a smoldering crater above what used to be the school’s basement.

“The Russians don’t care whom they kill. If they can’t kill a soldier, they kill an innocent child,” Mr. Haidai said in a social-media post. Ukraine’s rescue service said it would continue looking for possible survivors in Bilohorivka on Sunday.