Three people were killed and 31 wounded on Monday after Russian shelling hit the northeast Ukrainian city of Kharkiv, the regional governor said.

The mayor of Kharkiv, Ukraine’s second largest city, said on Telegram that the shelling struck civilian infrastructure including a commercial property and a tire repair shop.

These are “places which had no military significance,” Oleh Synehubov said, adding that two children aged 4 and 16 were among dozens of people taken to hospital.

“Several shells hit the yards of private houses. Garages and cars were also destroyed, several fires broke out,” he said.

Russia, which invaded Ukraine on Feb. 24, denies targeting civilians.

Kharkiv, which is close to the Russian border, suffered heavy bombardment in the initial phase of the war, followed by a period of relative calm, but that has been shattered by renewed shelling in recent weeks.