A Russian missile assault on an apartment block and other residential structures in Ukraine’s southern city of Zaporizhzhia early Sunday killed at least 13 people and injured 87 others, including 10 children, according to Ukrainian officials.

The early-morning bombardment was the city’s second in three days. It happened a day after a bomb exploded near Russia’s road-and-rail crossing to Crimea, a vital supply line for Russian soldiers fighting to retain territory surrounding the southern Ukrainian city of Kherson.

Russian aircraft launched at least 12 missiles into Zaporizhzhia in the latest strike, partially destroying a nine-storey apartment block, leveling five other residential buildings and damaging many more, said Oleksandr Starukh, governor of the Zaporizhzhia region.

“Twelve missiles came, all from planes,” he said on state-run television.

At least 13 people died and 87 others were wounded, 60 of whom were hospitalized, regional officials said. The wounded included 10 children.

The rescue operation at the nine-storey apartment building was complicated by a fire that broke out in the rubble, Starukh said.

“We pulled people out quickly and saved eight people already, but when the fire starts then people (under the rubble) have practically no chance of surviving as there is no oxygen,” he added.

Ukrainian President Volodymyr Zelenskiy condemned the attack as “absolute evil” by people he called “savages and terrorists”, vowing those responsible would be brought to justice.

Zaporizhzhia city, about 52 km (30 miles) from a Russian-held nuclear power plant, has been under frequent shelling in recent weeks, with 19 people killed on Thursday.

“Zaporizhzhia again. Merciless strikes on peaceful people again. On residential buildings, just in the middle of the night,” Zelenskiy said on the Telegram messaging app.

Emergency workers and firefighters cordoned off the nine-storey building and dug for survivors and casualties in the smouldering rubble of a massive central section that had collapsed.

The blast wrecked cars and left torn metal window frames, balconies and air conditioners dangling from the building’s shrapnel-pitted facade.

Rescue workers carried the bodies of residents who died out through a window and laid them out on the ground under blankets and in body bags.

Since the beginning of Russia’s invasion, the majority of the Zaporizhzhia area, including the nuclear facility, has been under Russian authority. The region’s capital, Zaporizhzhia, remains under Ukrainian authority.

Since Russia’s full-scale invasion began in February, Ukraine, the United States, the European Union, and human rights organizations have accused Russia of committing war crimes, claiming that attacks on civilian infrastructure, including schools and hospitals, have killed and injured thousands of people.

Moscow denies targeting people on purpose as part of a “special military campaign” to demilitarize its neighbor.