Teenagers watch the forensic procedures at a Perekryostok store in St. Petersburg after an explosion on Wednesday night.

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An employee of the Russian Emergencies Ministry at the Perekryostok store in St. Petersburg which was hit by an explosion.

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An employee of the Russian Emergencies Ministry at the Perekryostok store in St. Petersburg which was hit by an explosion.

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A Perekryostok store in St. Petersburg damaged by an explosion.

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An Investigative Committee officer during forensic procedures at a Perekryostok store in St. Petersburg after an explosion on Wednesday night.

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A Federal Security Service vehicle outside a Perekryostok store in St. Petersburg after an explosion on Wednesday night.

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Employees of the Russian Investigative Committee at the Perekryostok store in St. Petersburg which was hit by an explosion.

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Pedestrians outside a Perekryostok store in St. Petersburg after an explosion on Wednesday night.

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Employees of the Russian Investigative Committee at the Perekryostok store in St. Petersburg which was hit by an explosion.

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Employees of the Russian Investigative Committee at the Perekryostok store in St. Petersburg which was hit by an explosion.

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Employees of the Russian Investigative Committee at the Perekryostok store in St. Petersburg which was hit by an explosion.

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Employees of the Russian Investigative Committee at the Perekryostok store in St. Petersburg which was hit by an explosion.

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