Overnight explosions in western Russia led to the collapse of two bridges and derailed two trains, officials reported on Sunday. They did not specify what triggered the explosions. One incident resulted in seven fatalities and numerous injuries.

The first bridge, located in the Bryansk region near the Ukrainian border, fell onto a passenger train on Saturday, resulting in the casualties. Among the deceased was the train’s driver, as confirmed by Russian Railways, a state-run entity.

Hours later, officials said a second train derailed when the bridge beneath it collapsed in the nearby Kursk region, which also borders Ukraine.

Following this collapse, a freight train was thrown off the tracks onto the road below due to the blast, reported local acting Governor Alexander Khinshtein on Sunday. The accident ignited a fire, but fortunately, no injuries were reported.

Russia’s Investigative Committee, the country’s top criminal investigation agency, said in a statement that explosions had caused the two bridges to collapse, but did not give further details. It said that it would be investigating the incidents as potential acts of terrorism.

Rescue workers cleared debris from both sites, while some of those injured were transported to Moscow for treatment. Photos posted by government agencies in Bryansk appeared to show train carriages ripped apart and lying amid fallen concrete from the collapsed bridge. Other footage on social media was apparently taken from inside vehicles on the road that had managed to avoid driving onto the bridge before it collapsed.

Damage to railway tracks was also found Sunday by inspectors working on the line elsewhere in the Bryansk region, Moscow Railways said in a statement. It did not say whether the damage was linked to the collapsed bridges.

In the past, some officials have accused pro-Ukrainian saboteurs of attacking Russia’s railway infrastructure. The details surrounding such incidents, however, are limited and cannot be independently verified.

Ukraine’s military intelligence, known by the Ukrainian abbreviation GUR, said Sunday that a Russian military freight train carrying food and fuel had been blown up on its way to Crimea. It did not claim the attack was carried out by GUR or mention the bridge collapses.

The statement said Moscow’s key artery with the Russian-occupied Zaporizhzhia region and Crimea has been destroyed.

Russia forces have been pushing into the region of Zaporizhzhia in eastern Ukraine since Moscow’s full-scale invasion in February 2022. Russia took Crimea and annexed it in 2014.

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