AKIPRESS.COM - Thousands of people have protested in the Siberian city of Kemerovo, angry at Russian officials over the leisure complex fire that killed at least 64 people, 41 of them children.

President Vladimir Putin arrived in Kemerovo earlier and blamed "criminal negligence" for Sunday's blaze, BBC reported.

Investigators say the fire alarm was switched off and exits blocked. Four people have been charged. Another detained suspect - a guard from a private security firm - will be charged shortly, Russia's Investigative Committee says.

A national day of mourning is observed on Wednesday.

Several thousand people rallied outside the local government headquarters, saying that officials must be sacked over the fire safety shortcomings. Many demonstrators said they did not trust the authorities and did not believe the announced death toll was accurate.

Officials were booed when they urged the crowd to disperse, after the protest had already lasted seven hours, Russia's RIA news agency reported. Regional Deputy Governor Sergei Tsivilev then got down on his knees to beg forgiveness, and was applauded by the crowd.

Russian investigators have so far confirmed the deaths of 64 people, 21 of whom have been identified.

Some of the bodies were badly burned in the Zimnyaya Vishnya (Winter Cherry) complex, and DNA tests will be required, the Investigative Committee says.

It says it is too early to publish the victims' list, "to avoid any mistakes".