Ukrainian officials accused Russia of damaging a cancer hospital and several residential buildings in the southern city of Mykolaiv with shelling from heavy artillery.

The hospital’s head doctor, Maksim Beznosenko, said several hundred patients were in the hospital during the attack but that no one was killed. The assault damaged the building and blew out windows.

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Russian forces have stepped up their attacks on Mykolaiv, located 470 kilometres (292 miles) south of Kyiv, in an attempt to encircle the city.

Ukrainian and Western officials earlier accused Russia of shelling a maternity hospital in the southern city of Mariupol on Wednesday. Three people died in that attack.

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Earlier, Ukrainian President Volodymyr Zelensky accused Russia of kidnapping the mayor of the city of Melitopol, equating it to the actions of “ISIS terrorists.”

“They have transitioned into a new stage of terror, in which they try to physically liquidate representatives of Ukraine’s lawful local authorities,” Zelensky said in a video address Friday evening.

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Kirill Timoshenko, the deputy head of Ukraine’s presidential office, posted a video on the social media site Telegram which he said showed a group of armed men carrying the mayor, Ivan Fedorov, across a square.

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Russian forces captured the southern port city of Melitopol, with a population of 150,000, on February 26.