In Kaluga, part of the infrastructure at a Yandex data centre was damaged. Several modules have been completely put out of action, Russian media report.
The governor of Kaluga Region said nine people were injured. Yandex warned of disruptions to operations, ASTRA reports.
This is the second attack on the infrastructure of the Russian information technology company. The strikes began after Russians started launching large-scale attacks on data centres in Kyiv and other Ukrainian cities.
On 8 October, oil refineries in Bashkortostan caught fire in Russia as well as a plant in Ryazan Region, where a Yandex data centre is located.