A Russian drone attack on April 3 hit residential buildings Kharkiv in northeastern Ukraine, killing at least three people and injured 32, local officials said.

Thedrone attacktriggered fires, regional Governor Oleh Synyehubov, said on Telegram, adding that that two children were among the injured.

Synyehubov said several multistory apartment blocks had been hit, and a blaze erupted on the roof of one building. Rescue teams were still searching through the rubble for survivors hours after the attack. According to authorities, people were buried under the rubble.

Rescuers earlier recovered the remains of the third victim, Mayor Ihor Terekhov said. Terekhov said Russian troops launched at least 14 strikes on Kharkiv in just 40 minutes.

Synyehubov also said one person was hurt in a drone strike on Ruski Tyshky, a village outside Kharkiv, which has been hit repeatedly by Russian drone attacks in the past week.

In the southeastern city of Dnipro, three people were injured in a mass drone attack, the regional governor said.

And at least seven drones attacked targets in Zaporizhzhya region, injuring one, the regional governor said.

Moscow Mayor Sergei Sobyanin said early on April 4 that Russian air defense units repelled a drone flying toward Moscow.

"Emergency specialists are working at the site where fragments have fallen, Sobyanin said on Telegram.

Russian news agencies later quoted a representative of the federal transport agency as saying the capital's Vnukovo airport had been reopened for departing flights subject to further official approvals.

The agencies said two other airports had also been ordered to close but there was no immediate word on whether their operations had resumed.