Security guards stand in a cordon in downtown St. Petersburg as operative services check information on bombs planted in the city's buildings and retail centers.

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Entry to a mall in St. Petersburg is closed as operative services check information on bombs planted in the city's buildings and retail centers.

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A police officer stands in a cordon in downtown St. Petersburg as operative services check information on bombs planted in the city's buildings and retail centers.

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Security guards stand in a cordon in downtown St. Petersburg as operative services check information on bombs planted in the city's buildings and retail centers.

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Police seen here outside a retail center in St. Petersburg as operative services check information on bombs planted in the city's buildings and retail centers.

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Security guards stand in a cordon in downtown St. Petersburg as operative services check information on bombs planted in the city's buildings and retail centers.

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Police stand outside a retail center in St. Petersburg as operative services check information on bombs planted in the city's buildings and retail centers.

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A St. Petersburg law enforcement agency's van is seen here in downtown St. Petersburg as operative services check information on bombs planted in buildings and retail centers in the city.

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