A Ukrainian source informed Reuters on Friday that the internal intelligence agency of Ukraine has set off explosives along a Russian railway in Siberia, marking the second attack on military transportation routes in the region this week.

It seems that the events demonstrate that Kyiv is prepared and capable of carrying out sabotage missions in remote areas of Russia, causing disruptions to Russian supply lines that are far from the front lines of Moscow’s 21-month-long conflict in Ukraine.

The unidentified source stated that the explosives were activated while a cargo train was passing over the Chertov Bridge, located in the Buryatia region of Siberia. This region shares a border with Mongolia and is located thousands of kilometers away from Ukraine.

According to the source, due to a recent attack on a nearby tunnel, the train had to use an alternate railway line for a day until the situation was resolved.

According to Baza, a Russian news organization with insider information, a train on the alternate route caught fire due to ignited diesel fuel tanks. Six freight cars were also reported to be on fire, but there were no reported injuries. The cause of the explosions remains unknown.

According to a Ukrainian source, the Security Service of Ukraine (SBU) was responsible for both operations. The extent of the damage was described similarly, with reference to Russian Telegram channels.

I am unable to verify the accounts or determine if the route is used for military purposes. Russian Railways did not provide a statement regarding the recent event. The local division of Russia’s Investigative Committee has not yet responded to a written inquiry for a statement.

According to a Ukrainian source, the SBU set off explosives on Thursday during the previous attack, while a freight train was passing through the Severomuysky tunnel in Buryatia.

According to anonymous sources cited by the Moscow-based Kommersant newspaper, Russian authorities have determined that the train explosion was caused by a “terrorist act” carried out by unidentified individuals.

Russian Railways, the state company that operates the vast rail network, said traffic had been diverted along a new route after the first attack, slightly increasing journey times but not interrupting transport.

According to the Ukrainian source, the second attack was planned in advance to disrupt rail traffic and specifically targeted the alternate route at Chertov Bridge on Russia’s Baikal-Amur Mainline, which runs through Eastern Siberia and the Russian Far East.

The Trans-Siberian Railway in Russia is considered to be more significant for transporting freight than the Baikal-Amur Mainline.

An anonymous source from the Russian industry stated that the alternate route was in operation and being utilized for freight trains on Friday afternoon.