Russian officials say a blast on a bus in Volgograd killed more than a dozen people Monday, just one day after a suicide bombing killed 17 people at the city's train station.
Fatal Blasts in 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.
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Medics help wounded people near the entrance to a railway station in Volgograd, Russia, Dec. 29, 2013.
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This image made available by the Volgograd Mayor's Office shows bodies at an entrance to the railway station after a suicide attack in Volgograd, Dec. 29, 2013.