The second deadly bombing in two days has killed more than a dozen people in the Russian city of Volgagrad on Monday.

The bombing, which took place on a trolleybus in the city, takes places after one on Sunday at a train station in the same city which killed at least seventeen people.

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Monday’s attack becomes the third bombing in the city in as many months and is sparking heated worries about the violent situation in Russia ahead of the Winter Olympic Games scheduled to begin in the city of Sochi just weeks from now.

Though no group has yet claimed responsibility for the bombing the widely held speculation is that the attacks are the work of Islamist separatists from the Caucacus region, including Dagestan and Chechnya, where military factions have vowed to target the Olympics as part of their continued fight against the government of President Vladimir Putin.

The Guardian reports on Monday’s boming:

Reuters adds:

And The New York Times reports on the unprecedented level of security already in place ahead of the Sochi games:

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