Fire engulfed one of the largest shopping centres near Moscow early this morning, emergency services said, leading to the collapse of part of the structure, which complicated firefighters' efforts to douse the flames.
The blaze spread over an area of about 7,000 sq m (75,000 sq ft) in the Mega shopping centre in Khimki near the Russian capital, authorities said.
One person died in the fire, authorities say.
Russia's Investigative Committee, which probes major crimes, said it was looking into the cause of the fire.
The head of the Moscow region's emergency services agency said it appeared the blaze was the result of safety regulations being violated during repair work on the building.
Mega had been home to a large number of Western retail chains before the companies' departure from Russia in the wake of the Ukraine war, including one of the first IKEA stores in the Moscow area.