Teams of workers strove Monday to repair a bridge in southwestern Russia near the border with Ukraine that was damaged in what a local governor described as an act of sabotage.
The regional administration said it expects the repair work will be completed Wednesday.
Kursk regional Gov. Roman Starovoit said Sunday that the bridge was blown up by unidentified attackers and the Investigative Committee, Russia's top state investigative agency, has launched a criminal probe into what it described as a "terrorist act."
Officials didn't specify the significance of the bridge for the war, but it sits on a key railway link used to ferry supplies to
Russian troops fighting in eastern Ukraine.
No one has claimed responsibility for the attack on the bridge, that follows a series of explosions and fires in western Russia amid the war in Ukraine that has entered a third month.
On April 1, two Ukrainian helicopter gunships struck an oil depot in Belgorod, according to Russian officials, causing a massive fire.
A week ago, a massive blaze erupted at an oil depot in the western city of Bryansk owned by Transneft-Druzhba, a subsidiary of the Russian state-controlled company Transneft that operates the western-bound Druzhba (Friendship) pipeline carrying crude to Europe. The fire didn't cause any disruption in oil deliveries.
On the same day, another oil storage facility in Bryansk also caught fire.