Thousands of residents have held a rally in the Russian city of Kemerovo to demand a full probe following a fire in a shopping centre that killed at least 64 people, many of them children.
The protesters are disputing the official death toll, claiming the authorities are hiding the real scale of the disaster.
The blaze engulfed the Winter Cherry mall in Kemerovo on Sunday, the first weekend of the school holidays, trapping dozens of parents and children.
Eyewitnesses reported that fire alarms were silent and many doors were locked.
President Vladimir Putin has flown to Kemerovo but has not spoken to the protesters yet.