An Ural Airlines Airbus A321 performing flight from Moscow Domodedovo to St. Petersburg completed an uneventful flight with a safe landing in St. Petersburg and taxied to the apron.

The passengers disembarked via stairs at the front left main door, 90 passengers disembarked without problem, however, when a mother with her one year old infant stepped onto the stairs the platform collapsed and mother and infant fell down onto the concrete apron.

The infant is reported in critical condition with traumatic brain injuries, the mother received serious injuries (fractures of her legs), both were taken to a hospital.