Investigators gather at the Lame Horse nightclub, the morning after fire killed at least 101 people.
The tragedy has stunned the city of Perm, the sixth largest city in Russia and a home to 1.2 million people.
Shortly before the fire on Friday night there was no sign that the club's anniversary celebrations were about to take a tragic turn.
Dancers entertained revellers in front of a stage where witnesses said firework fountains were later set off.
Survivors described fear and panic after the ceiling of the venue caught fire, spreading flames and dense black smoke.
Smoke spewing from the entrance of the Lame Horse gives an indication of the intensity of the blaze.
Inside, scores perished, overcome by the choking smoke, heat and crush of bodies trying to escape the building.
Rescuers laid bodies on the street outside the club, ahead of the grim task of identifying the dead.
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