Russia came under the largest attack from Ukrainian drones in two years with an oil refinery in the Moscow struck for the second time this week. File photo courtesy EMERCOM of Russia Press Service/EPA-EFE

June 18 (UPI) -- Russia came under the largest attack from Ukrainian drones in two years early Thursday with an oil refinery in the southeast of the capital struck for the second time this week and damage to a shopping center and an apartment building. One person was slightly injured.

The state-run TASS news agency said hundreds of drones targeted multiple Russian regions, 555 of which were downed or intercepted. The attack came a month after a May 17 raid when 556 Ukrainian drones were shot down.

Moscow Mayor Sergey Sobyanin said Thursday that air defenses had downed more than 190 drones over the city but that several managed to get through to the Moscow Oil Refinery in Kapotnya, where measures were being taken to "address the aftermath."

Footage circulating online of Moscow shows black smoke billowing from raging fires, blackened skies over a significant area and at least one fireball from a large explosion that in some of the videos appears to show the lid of a fuel storage tank being blasted hundreds of feet skyward.