Looks like terrorists plan on leaving a mark at these Olympics.
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The deaths of at least 16 people in a suicide bombing in southern Russia on Sunday fit a pattern of recent terror attacks and increased the focus on already-heavy security for the Sochi Olympics in six weeks, U.S. scholars of Russia say.

No one immediately claimed responsibility for the bombing in Volgograd, but it came several months after Chechen rebel leader Doku Umarov called for attacks against civilian targets in Russia, including the Sochi Games. Umarov, the self-proclaimed emir of a terrorist group that calls itself the Caucasus Emirate, has called on Muslims to prevent the Olympics from occurring.

“An open question is how much authority he really has over these different groups,” said Jeffrey Mankoff, deputy director and fellow at the Center for Strategic and International Studies’ Russia and Eurasia Program. “A lot of the attacks seem to be inspired by Umarov but may not be directly controlled by him.”

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