Ukrainian officials said at least 38 people, including 12 children, were wounded in a Russian missile strike which an officer said targeted a military funeral in the northeastern Kharkiv region.
The strike had hit a parking lot outside a residential building in the small town of Pervomaiskyi.
Television footage showed a nine-storey residential building in the town of some 28,000 people with smashed windows and black smoke pouring out.
"Thirty-one people have been hospitalised," the head of Kyiv's presidential office Andriy Yermak said.
Nine of those were children, including two babies aged one year and ten months, he added.
Prosecutors said the youngest hurt in the attack was a child of three months. The child's condition was not immediately clear.
Mr Yermak posted images of burned and destroyed cars, some of which were lying upside down or on their side.
Oleh Synehubov, the governor of the Kharkiv region, said on the Telegram messaging app that the shelling took place at 13.35 local time and several cars were on fire.
Mr Synehubov said the windows of eight multi-story building were smashed. He posted several pictures of the building with smashed windows, dark smoke clouds, charred trees, and an overturned vehicle.
Major Maksym Zhorin, a former commander of a fighting unit known as the Azov battalion that is now part of the Ukrainian army, said the town was hit as people gathered for the funeral of Oleh Fadeenko, a soldier with the call-sign "Baby" who he said had been killed in combat near Bakhmut in eastern Ukraine.
"They targeted the site where the ceremony was taking place," Mr Zhorin said on Telegram.
Pervomaisky is around 80 kilometres south of the regional capital Kharkiv. It is relatively far from current fighting hotspots in the Donbas region.
The Kharkiv region, which borders Russia, saw heavy fighting at the start of Russia's invasion launched last year, with Russian troops crossing into Ukraine through the region.
Russia did not immediately comment on the incident but has consistently denied deliberately targeting civilians.
Yesterday, a Russian drone attack killed at least two people and injured 19 in the northern Ukrainian city of Sumy, prompting Ukrainian President Volodymyr Zelensky to call for a major upgrade of anti-aircraft defences.
