Mayor Vitali Klitschko announced the decision via his Telegram channel, as reported by Ukrinform.
"April 25 is declared a day of mourning in Kyiv. In memory of the victims of the enemy's massive attack on the capital," the post stated.
As reported, during the attack, Russian drones and missiles struck several districts, causing fires as debris fell across the city. Eight fatalities have been confirmed following the massive Russian attack, with over 70 people reported injured.