Flowers at the Volgograd main railway station

A policeman guards as flowers are placed at the Volgograd main railway station, Russia early Monday, on Dec. 30, 2013. A bomb blast tore through a trolleybus in the city of Volgograd on Monday morning, killing at least 14 people a day after a suicide bombing that killed at least 17 at the city's main railway station. Volgograd is about 650 kilometers (400 miles) northeast of Sochi, where the Olympics are to be held. Source: AP

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