Heightened Security in Russia After Attacks

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Russian police investigators collect evidence following a suicide attack at a train station in the Volga River city of Volgograd, about 900 kms (560 miles) southeast of Moscow, on December 29, 2013.
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Across Russia, heightened security measures are in place after twin bombings in the city of Volgograd killed at least 32 people earlier in the week.  

Meanwhile, around the world, Olympic athletes and fans and international official are wondering what implications, if any, those attacks might have on the Sochi Winter Olympics. 

Kimberly Marten, political science professor at Barnard College, puts the violence into context.