At least 64 people, many of them children,were killed when a fire engulfed a shopping and entertainment mall in Siberia.
Russia's Investigative Committee and witnesses spoke of blocked exits and "serious violations" at the Winter Cherry mall.
Sunday's blaze started on an upper floor. The mall's shops, cinema and bowling alley were packed at the time.
Video on social media showed people jumping from windows to escape.
The Investigative Committee says a fire safety technician at the complex "switched off the alarm system" after being alerted about the fire.
The committee says two other fire safety officials have been detained for questioning, along with the Winter Cherry complex's technical director and the manager of a business located where the fire started.
