April 2 (UPI) — At least five people were killed and 11 injured in large-scale Russian strikes across Ukraine involving more than 360 drones, Ukrainian authorities said.

One person was killed and two injured, one of them a 12-year-old boy, in the southeastern city of Synelnykove, after drone and artillery strikes across Dnipropetrovsk province overnight.

In an online post, Dnipropetrovsk Military Administration head Oleksandr Hanzha said that an administrative building and a shopping complex were set ablaze in Synelnykove as well as infrastructure, a dozen apartment buildings and private houses and buses in a series of strikes also targeting Pavlohrad and communities to the south in and around Nikopol.

Four people were killed and four injured on both banks of the Dnipro River in Cherkasy province, some 80 miles downstream from Kyiv, amid mass daytime attacks on Wednesday centered on central and western Ukraine.

The fatalities occurred in a blast in the Zolotoniskyi district after local residents gathered in an open area where a drone had crashed and the warhead detonated without warning.

Cherkasy Regional Prosecutor’s Office said in a Telegram post that it had launched a pre-trial investigation into the attack as a possible war crime and reiterated warnings to people to stay well away from downed drones, drone debris and other munitions.

“Law enforcement agencies and rescue services once again emphasize: any fragments of UAVs, missiles, or other explosive objects pose a mortal threat. WHAT EVERYONE NEEDS TO KNOW: It is strictly forbidden to: approach the crash site of a UAV; touch the debris; photograph or film them up close; carry any parts of the object,” the prosecutor’s office added.

Four civilians were injured in air attacks on Cherkasy district, three of them passengers on a bus that was struck by debris from a Russian drone, said the province’s governor, Ihor Taburets.

In Poltava, 125 miles to the east, four people, including a child, were injured when a drone hit a private holding and one person was injured in attacks targeting critical infrastructure facilities in the far west of Ukraine, close to the border with Romania in Zakarpattia province.

The Ukrainian Air Force reported hundreds of drones crossing into Ukraine from the southeast, headed toward western regions, including Ivano-Frankivsk and Chernivtsi with blasts heard in Lviv and Ternopil and damage reported in the cities of Lutsk, Khmelnytskyi and Khotyn in Volyn, Khmelnytskyi and Chernivtsi provinces.

Khotyn Mayor Andrii Dranchukon took to social media Thursday morning to call on residents to limit their electricity use to essential purposes, saying damage to power infrastructure from drones would take up to two weeks to repair and pledging assistance to people whose homes had sustained damage.