The Nizhny Novgorod police found the culprit of the fire in the shopping center, which caused the evacuation of 500 people.
He turned out to be a 10-year-old boy. He found a lighter in the playroom and wondered if the gym mat that was in the dome of the maze would catch fire.
"Seeing the fire and smoke, the boy tried to put it out on his own, but soon got scared and ran to his grandmother without saying anything to her. When others noticed the fire, the grandmother and grandson left the play area," the Interior Ministry reported.