A suicide bomber struck a busy railway station in southern Russia on  Sunday, killing herself and at least 15 others and wounding scores more,  officials said, in a stark reminder of the threat Russia is facing as  it prepares to host February’s Olympics in Sochi.     No one  immediately claimed responsibility for the bombing in Volgograd, but it  came several months after Chechen rebel leader Doku Umarov called for  new attacks against civilian targets in Russia, including the Sochi  Games.     Suicide bombings have rocked Russia for years, but many have been  contained to the Caucasus, the centre of an insurgency seeking an  Islamist state in the region. Until recently Volgograd was not a typical  target, but the city formerly known as Stalingrad has now been struck  twice in two months — suggesting militants may be using the  transportation hub as a renewed way of showing their reach outside their  restive region.     Volgograd, which borders the Caucasus, is 900  kilometres (550 m...
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