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)