* Fire tore through shopping mall on Sunday
* Blaze was on a floor with a children's play area
* Investigators have opened a criminal investigation
* Some children feared dead in the inferno
At least 64 people were killed by a fire which engulfed a busy shopping mall in the Siberian city of Kemerovo, Russian investigators said on Monday, and some of the dead were children.
The fire, one of the deadliest in Russia since the break-up of the Soviet Union, swept through the upper floors of the "Winter Cherry" shopping centre on Sunday afternoon where a cinema complex and children's play area were located.
Emergency services said they had extinguished the blaze, but later said it had reignited, and that rescuers were struggling to reach the building's upper floors because the roof had collapsed. TV footage on Monday showed thick black smoke rising from the yellow building.
It was unclear if any people were still unaccounted for, but 11 people were being treated in hospital, including an 11-year-old boy who was in a serious condition.
Earlier on Monday, people had posted appeals on social media seeking news of their relatives or friends, and authorities set up a centre in a school near the mall to deal with inquiries.
Anna Kuznetsova, Russia's children's rights commissioner, said the fire had been caused by incompetence and warned there were many similar shopping centres.
"Other regions, the bosses of other malls must right now, without waiting for (routine) checks, ask themselves: Have we done everything we can to ensure something like this doesn't happen here," Kuznetsova said in a statement.
The shopping mall, a former cake factory, had few windows or doors.
