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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A policeman patrols a street with New Year's decorations, central Volgograd, Russia, Jan. 1, 2014.
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A woman cries outside the main railway station, Volgograd, Russia, Dec. 31, 2013. 
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Investigators work at the site of a blast on a bus in Volgograd, Russia, Dec. 30, 2013.
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Members of the emergency services work at the site of a bomb blast on a bus in Volgograd, Russia, Dec. 30, 2013.