Swedish ball bearing make SKF said Tuesday that three employees had been killed at its factory in the western Ukraine city of Lutsk, after their factory was damaged in an attack overnight.

"We can confirm that there was an attack last night on the city of Lutsk in Ukraine, where we have a factory that was hit in the attack. We are very sad to also be able to confirm that three of our employees died in this attack," Carl Bjernstam, an SKF spokesman, told AFP in a statement.

Lutsk mayor Igor Polishchuk had earlier said on Telegram that "there are three dead and three wounded" after air strikes hit western Ukraine.