MOSCOW (Reuters) -Russian air defences repelled an attack by four drones flying towards Moscow, Mayor Sergei Sobyanin said on Friday, with no injuries reported in the capital or in an earlier attack on an oil complex in one of Russia's southern regions.

Massive flames and black acrid smoke rose into the night's sky following the strike, with the blaze rapidly spreading to cover an area of more than 10,765 square feet.

Russian air defences on Friday repelled an attack by four drones flying towards Moscow, with no injuries reported in the capital or in an earlier attack on an oil complex in one of Russia’s southern regions.

"The air defense forces repelled an attack by four drones heading toward Moscow," he wrote. "Emergency service specialists are working at the sites where debris fell." Read also: Drone attack hits Moscow suburbs,