At least four people were killed and six others wounded in Russian airstrikes carried out overnight from Monday to Tuesday near the city of Kharkiv in northeastern Ukraine, the regional governor said on Tuesday morning.

Oleh Syniehubov wrote on Telegram that “the death toll from the enemy attack on the outskirts of Kharkiv has risen to four, and six people were injured.”

Earlier in the night, he had warned residents of a “threat from hostile drones,” initially reporting two fatalities before updating the figures.