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FILE - In this Tuesday, Aug. 17, 2010 file photo police officers guard the site of an explosion after a parked car exploded outside a cafe in downtown Pyatigorsk, a city in southern Russia. A series of unexplained killings in southern Russia involving booby-trapped bombs has further heightened security fears ahead of next month's Winter Olympics in Sochi. A spokesman for Russia's main investigative agency, said in a statement that no motive had yet been found for the killings on Wednesday, Jan. 8, 2014 on the outskirts of Pyatigorsk, which is the center of an administrative district created in 2010 to coordinate efforts to combat the insurgency. (AP Photo/Viktor Korotayev, File)

FILE - In this Tuesday, Aug. 17, 2010 file photo police officers guard the site of an explosion after a parked car exploded outside a cafe in downtown Pyatigorsk, a city in southern Russia. A series of unexplained killings in southern Russia involving booby-trapped bombs has further heightened security fears ahead of next month's Winter Olympics in Sochi. A spokesman for Russia's main investigative agency, said in a statement that no motive had yet been found for the killings on Wednesday, Jan. 8, 2014 on the outskirts of Pyatigorsk, which is the center of an administrative district created in 2010 to coordinate efforts to combat the insurgency. (AP Photo/Viktor Korotayev, File)

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