Forty-one children were killed in a fire at a shopping mall complex in Kemerovo, Russia, local media has reported.
Both RIA and Interfax news agencies reported the figure, saying that a list of victims has been made available to relatives.
It came as thousands of residents held a rally in the city, demanding a full inquiry into what happened.
Protesters claimed authorities have been hiding the true death toll and the number killed was higher.
Russian President Vladimir Putin, on a visit to Kemerovo, said earlier that "criminal negligence" was behind the blaze that killed 64 people in the Siberian city.
Hundreds of angry protesters gathered in central Kemerovo on Tuesday morning, many of them in tears.
One of them shouted: "Why don't they tell us the truth?" A placard read: "How many victims are there really?"
Witnesses reported that fire alarms were silent and many doors, including those to a cinema, were locked.
Mr Putin, who has announced that Wednesday will be a day of national mourning, laid flowers in tribute to the victims, though it is not known whether he has spoken to those affected.
His comments, aired on state television, came after investigators said a security guard had turned off the public address system and fire exits had been illegally blocked.
Russia's Investigative Committee said there had been "serious violations" at the Winter Cherry mall, which is situated in an industrial coal-mining city 3,600km (2,200 miles) east of Moscow.
Up to 11 people are still believed to be missing, while a search is under way for the security guard.
Parents of missing youngsters have been posting pictures in an attempt to find their loved ones.
The complex contained a zoo, a children's play area, and ice rink and a cinema.
Russian television broadcasts showed people leaping from the windows of the building which was engulfed in black smoke.
The Investigative Committee, which handles major crimes in Russia, said 10 people were being treated in hospital. It added that 44 had sought medical treatment.
Four people, including one of the shopping centre's tenants, have been held for questioning.
The committee did not comment on the cause of the fire.
Among those whose fate is unknown is a 12-year-old girl, Viktoria 'Vika' Pochankina, who became trapped in the mall's cinema while watching a film with classmates, according to the Siberian Times.
When her aunt Evgenia called her, Vika said: "Everything is burning, the doors are blocked. I can't go out, I can't breathe."
Before the call ended, Vika reportedly added: "Auntie, tell all my family I love them, tell mum that I loved her."
Shopper Ivan told the Siberian Times he had been at an indoor ice rink with his children.
"As we rushed out of the building, I saw a teenager falling out of a window," he said.
"'There was no fire alarm, no automatic fire extinguishing."
A petting zoo was among the centre's attractions. All of its 200 animals - including foxes, deer, meerkats, squirrels and hamsters - are thought to have perished.
The blaze erupted on the top floor of the four-storey shopping centre near the cinema complex and children's play area on Sunday afternoon.
The building was converted into a shopping centre from a former confectionery factory in 2013.
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