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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A woman puts a flower outside wreckage of a trolleybus, Volgograd, Russia, Dec. 31, 2013.

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Flowers and toys are placed at the site of a trolleybus bombing in Volgograd, Russia, Dec. 31, 2013.

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A woman cries outside the main railway station, Volgograd, Russia, Dec. 31, 2013.

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Russian soldiers patrol the Battle of Stalingrad memorial in Volgograd, Russia, Dec. 31, 2013.