Four people were killed in a rocket attack on a residential area of the western Ukrainian city of Lviv overnight on Thursday, the Interior Ministry said.
At least nine people were injured, the ministry said on Telegram.
A search and rescue operation were under way, it said, and so far, seven people had been pulled alive from the rubble.
More than 60 people were reportedly evacuated from the destroyed houses.
Ukrainian President Volodymyr Zelensky wrote on Telegram that there would “definitely be a response to what he termed an attack by Russian terrorists.’’
Videos showed heavily damaged and, in some cases, almost completely destroyed residential buildings.
The mayor of Lviv, Andriy Sadovyi, described it as the most serious attack on the civilian infrastructure of Lviv since the beginning of the Russian war against Ukraine more than 16 months ago.
More than 50 houses were destroyed.
Lviv is also home to many refugees from the war-torn areas of eastern Ukraine.
Until June, the city in the west of the country had remained relatively quiet.
Then, however, it became the target of airstrikes again.
Ukraine launched a counteroffensive against Russian forces at the beginning of June. (dpa/NAN)
