CNN
 — 

A fuel tank exploded early Saturday on Europe’s longest bridge, which links Russia to the annexed territory of Crimea, according to Russian state media RIA and social media footage.

Images of the Kerch bridge posted on social media appear to show a portion of the roadway of the vehicle and rail bridge had fallen into the waters below it. Flames are seen burning from rail cars above.

The tanker was located on the 19-kilometer (11 mile) long bridge – strategically important because it links Russia’s Krasnodar region with the Russian-annexed Crimean Peninsula.

The bridge spans the Kerch Strait, which connects the Black Sea to the Sea of Azov, on which sit key Ukrainian ports, including Mariupol.

The source of the explosion remains unclear.

Work is “underway to extinguish the fire,” the adviser to the Russian administration head of occupied Crimea, Oleg Kryunchkov, said in a Telegram post, adding that the bridge’s “shipping arches were not damaged.”

An official in Russian-annexed Crimea blamed “Ukrainian vandals” for the explosion on Kerch bridge in a post on Telegram.

“Ukrainian vandals somehow managed to get their bloody paws on the Crimean bridge. And now they have something to be proud of, in 23 years of their economic activity, they did not manage to build anything deserving of interest in Crimea. But they did succeed in damaging the roadbed of the Russian bridge,” Chairman of the State Council of the Republic of Crimea Vladimir Konstantinov said.

“Such is the whole essence of the Kiev regime and the Ukrainian state … Of course, the causes of the accident will be investigated, and the damage will be repaired swiftly,” he added.

CNN cannot independently verify Konstantinov’s claim.

In an interview in August, a senior Ukrainian military commander said the Kerch bridge was a legitimate target.

“This is a necessary measure in order to deprive them (Russia) of the opportunity to provide reserves and reinforce their troops from Russian territory,” Maj. Gen. Dmytro Marchenko said in an interview with RBC-Ukraine.

Meanwhile, a cargo train in Ilovaisk in the Russian-occupied Donetsk region was hit by a “powerful explosion” Saturday morning, according to the adviser to Mariupol Mayor Petro Andrushenko.

“Not only Crimea. Not only fuel tanks. There is also a cargo train in Ilovaisk. Locals report a rather powerful explosion and subsequent detonation at night. The occupiers now have big problems with supplies from both sides,” Andrushenko said.

Pro-Russian authorities in the self-declared republic of Donetsk confirmed the cargo train incident, releasing video Saturday showing the fire’s aftermath at a local railway station.

The Kerch bridge is able to handle 40,000 cars a day and to move 14 million passengers and 13 million tons of cargo per year, state news agency RIA Novosti reported when the bridge opened in 2018. Its opening – according to Russia’s official narrative – claimed to mark the physical “reunification” of Crimea with the Russian mainland.

After the bridge opened, the United States condemned its construction as illegal.

“Russia’s construction of the bridge serves as a reminder of Russia’s ongoing willingness to flout international law,” according to a US State Department statement at the time.

“The bridge represents not only an attempt by Russia to solidify its unlawful seizure and its occupation of Crimea, but also impedes navigation by limiting the size of ships that can transit the Kerch Strait, the only path to reach Ukraine’s territorial waters in the Sea of Azov.”