"At 6:13 a.m. the fire was contained. Seven bodies of victims have been found," the statement said. Three of the victims are children aged 4 years, 6 years and 5 months.
READ MORE: WATCH Pedestrian Bridge Collapse in Moscow's Gorky Park, 13 Injured
Local emergencies services received a call about the fire at 5:57 a.m. Moscow time (02:57 GMT) with the blaze having hit 5 square meters (about 54 square feet).
Governor of the Orenburg Region Yury Berg left Orenburg for Orsk to attend the site of the tragedy. An investigation into the deadly fire has been initiated.