Russian missiles slammed into a town in southern Ukraine, killing seven civilians, including children, and wounding dozens more, local authorities reported.

Ukrainian officials published photos of bodies stretched out under picnic blankets in a park in Vilniansk, and deep craters in the blackened earth next to the charred, twisted remains of a building.

Thirty-six people were wounded in Saturday evening’s attack, authorities said. A day of mourning has been declared on Sunday.

Vilniansk is in the Zaporizhzhia region, less than 20 miles (30km) from the local capital and north of the frontlines, as Russian forces continue to occupy part of the province.