A Russian airstrike on a prison in a frontline region in southeastern Ukraine has killed 16 people and wounded more than 30 others, according to Ukrainian officials.

The overnight attack in Zaporizhzhia also damaged surrounding homes, regional leader Ivan Fedorov said. Russian forces launched eight strikes using high-explosive aerial glide bombs, he added.

The Ukrainian president's chief of staff, Andriy Yermak, condemned the strikes as "another war crime" committed by Russia.

Zaporizhzhia is one of four eastern regions in Ukraine that Russia claims to have annexed since 2022, although the region is largely under Ukrainian control.

Ivan Fedorov said buildings at one of Zaporizhzhia's prisons were destroyed, without detailing where in the region they were.