Ukrainian Prime Minister Serhiy Koretskyi said Russia launched the largest attack on Ukraine’s energy infrastructure since the spring, primarily targeting Kyiv and the surrounding region, according to the BBC.

At least six people were killed and 33 injured in the overnight attacks across the country, including a child in the Kyiv region, according to local authorities cited by the BBC. DTEK, a major private Ukrainian energy company, said crews had restored electricity to about 8,000 households after the attacks, according to Al Jazeera. Russia’s Defence Ministry said its forces had struck power infrastructure in the Kyiv region, according to Al Jazeera.