The southern Ukrainian city of Mykolaiv came under Russian shelling, possibly the strongest since the war began in February, and led to the deaths of two people, officials said Sunday.

“Mykolaev came under intense shelling today. It could be even stronger,” the city’s mayor Oleksandr Senkevich wrote in a telegram, adding that powerful explosions rang out in two waves on Saturday and Sunday nights.

The governor of the region, Vitaly Kim, said two civilians were killed in the attack. Other strikes hit Kharkiv (east) and Sumy (northeast) regions.

Kharkiv Mayor Igor Derekov announced that some buildings were damaged in a series of explosions in Ukraine’s second city.

One person was killed and two others were wounded in the Sumy region, which has been the target of more than 50 strikes in the past 24 hours, according to Governor Dmytro Shvitsky.

The governor of Donetsk region, where Moscow has focused most of its attacks, Pavlo Kirilenko, said Saturday’s blasts killed three civilians and wounded eight others.

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