Russian President Vladimir Putin has visited the city of Volgograd, the site of this week's twin suicide bombings that left 34 people dead.
Putin Visits Volgograd, Russia
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Smoke pours out of the railway station after an explosion, Volgograd, Russia, Dec. 29, 2013.
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Investigators work at the site of an explosion near the entrance to a train station in Volgograd, Russia, Dec. 29, 2013.