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A Russian police officer stands on a street in Sochi

A Russian police officer stands on a street in Sochi December 30, 2013. The International Olympic Committee has no doubt Russian authorities will be able to provide security at the Winter Olympics, a spokeswoman said on Monday after two bomb blasts killed tens of people in the Russian city of Volgograd. REUTERS/Maxim Shemetov (RUSSIA - Tags: SPORT OLYMPICS CRIME LAW DISASTER)

Sochi on high alert after attacks in Russia

President Vladimir Putin, who has staked his prestige on February's Winter Olympics in Sochi and dismissed threats from Chechen and other Islamist

militants in the nearby North Caucasus, ordered tighter security

nationwide after another bomb shocked the country on Dec. 30.

A bomb ripped a bus apart in Volgograd on Monday, killing 14 people in

the second deadly attack blamed on suicide bombers in the southern

Russian city in 24 hours and raising fears of Islamist attacks on the  Olympics. (Reuters)