More than a dozen feared dead after a female suicide bomber blew herself up at a train station in Russia.<br/> <br />It was the second deadly attack in the space of three days as the country prepares to host the Winter Olympics.<br/> <br />Authorities say the bomber detonated her explosives in front of a metal detector just inside the main entrance of the train station in Volgograd.<br/> <br />Local media is reporting that President Vladimir Putin ordered law enforcement agencies to take all necessary measures to ensure security.
