Vinnytsia, Ukraine - At least 20 people were killed in a Russian missile attack in the center of the western Ukrainian city of Vinnytsia, according to the authorities.

Another 90 were injured, police chief Ihor Klymenko announced on Facebook on Thursday. According to the report, three rockets hit an office center. A fire broke out, torching about 50 parked cars.

Ukrainian President Volodymyr Zelensky reacted immediately: "What is this, if not an open terrorist act?" he wrote on the Telegram messaging service.

He said Russia was killing civilians every day and attacking civilian objects with missiles where there were no soldiers present.

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"Barbarians. Murderer state. Terrorist state," Zelensky wrote.

Since its invasion of Ukraine at the end of February, Russia has repeatedly stressed that it only attacks military targets, even though the many civilian victims are obvious.

The southern Ukrainian port city of Mykolayiv was also struck by missiles again during the night. The nine missiles hit buildings such as a hotel and at least one school. The authorities said one person was injured.

Meanwhile, in the Donetsk region of eastern Ukraine, clean-up operations were completed in Chasiv Yar, where a residential building was destroyed on Saturday. Since then, a total of 48 bodies have been recovered, according to the authorities.