According to the governor of the Ukrainian region of Kharkiv, a Russian drone strike on Ukraine’s second-largest city of the same name killed seven people overnight, including three children.

The governor said Saturday that the Iranian-made Shahed drone struck civilian infrastructure, causing a huge fire that burned down 15 private homes.

Ukraine’s interior minister reported that over 50 people had been evacuated and emergency workers had contained the blaze by Saturday morning.

Ukraine’s military says air defenses destroyed 23 out of the 31 drones launched by Russia overnight.

The statement noted that the drones primarily targeted Kharkiv and the province of Odesa.