Ukrainian drone attacks have killed at least eight people at warehouses in Russia, according to regional officials.

Seven of those killed were working at a distribution center at Kotovsk in the Tambov region. The eighth fatality was at a similar center in Elektrostal in the Moscow region.

The attacks are the most lethal Ukrainian strikes reported inside Russia in more than two years.

Both the facilities struck belonged to a Russian company, Wildberries, a major online retailer. Ukraine says the facilities were used in drone manufacture.

Twenty-five people were injured, seven of them critically, in the strike in Tambov, according to the region’s governor, Yevgeniy Pervyshov.