Alleged Ukrainian drone strike blasts oil refinery in Russia VIDEO

The blaze broke out at a heat transfer unit in Russia's Novoshakhtinsk oil refinery, located in the southern Rostov region, on Wednesday morning. Video footage has emerged on social media of the building in flames. Plumes of black smoke can be seen billowing into the sky as the fire continues to burn.

According to The Daily Express, the incident did not injure anyone. 

The fire brigade is working to put out the blaze at the facility, which has an annual capacity of up to 7.5 million tonnes of crude.

According to a Russian telegram, the fire erupted after a strike reportedly launched by a Ukrainian UAV. 

An unidentified source in the local authorities said the fire broke out after two Ukrainian drones were spotted over the plant. 

The source told TASS that one of them made an impact, crashing into a heat transfer unit, after which the blaze started. The second one flew away."

The local emergency service said the blaze has been put out, Interfax news agency reported.

It comes after a spate of mysterious fires across Russia sparked speculation Ukraine is targeting infrastructure in Moscow.

Russian President Vladimir Putin has been hit with a series of suspected incidents of sabotage in Russia over the past few months. 

Dozens of fires in Russia have been reported since the Kremlin launched its illegal invasion of Ukraine on February 24.

The number of incidents has been steadily rising over the past few weeks.