Russia launched a barrage of drone and missile attacks on Ukraine early Sunday, which officials said was one of the most intense attacks on Kyiv since the war began, according to reports.

Authorities reported at least four people were killed nationwide, with more than 14 wounded, and damage suffered to residential buildings, factories, and a cardiology clinic in Kyiv, Reuters reported.

According to Ukraine’s military, Russia launched 595 drones and 48 missiles overnight and air defenses managed to shoot down 568 drones and 43 missiles. 

The capital was the main target of the attacks, with explosions heard across Kyiv for more than 12 hours, Reuters also reported.