Putin orders Russian security on high alert before Olympics

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A police car is seen damaged by an explosion near a security checkpoint in the city of Khasavyurt, in the province of Dagestan, February 14, 2013. A suicide bomber killed three policemen and injured another six at a police security checkpoint early on Thursday, Russian investigators said, in the volatile North Caucasus region, where the Kremlin is fighting to staunch an Islamist insurgency. REUTERS/Abdula Magomedov/NewsTeam/Handout