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A man named unofficially as Artur Gadzhiev, 19, is believed to be the killer and was armed with blades and a fake suicide belt in the ISIS-claimed attack
Now, new footage shows the suspect plant what appears to be a Molotov cocktail in a shopping centre before it explodes into flames.
Russian officials on Saturday gave minimal details about the attack in the Siberian oil city and initially played down claims of a terrorism incident.