The region's Kremlin-installed governor, Mikhail Razvozhayev, confirmed the attack and said that two drones were involved, one of which was shot down.
The fire reportedly engulfed several oil-product storage terminals, although the exact number remains disputed between Ukraine and Russia.
The explosions have been a frequent occurrence in the area since August, with Russian authorities claiming they are caused by Ukrainian drones.
No injuries were reported in the latest incident, and the city's fuel supply was unaffected.
The Ukrainian military has denied responsibility for the attack. (ILKHA)