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</a> Volgograd lies some 650 kilometers (400 miles) to the northeast of the North Caucasus, while Sochi sits to the west along the Black Sea. No one immediately claimed responsibility for Monday's suicide bombing, but it was the first outside the North Caucasus since Chechen rebel leader Doku Umarov three months ago called for a resumption of attacks on civilians and urged militants to target the Sochi Games.