By using Maria Tsvetkova VOLGOGRAD, Russia (Reuters) – A bomb ripped aside a bus in Volgograd on Monday, killing 14 people in the 2d deadly attack blamed on suicide bombers in the southern Russian city in 24 hours and raising fears of Islamist attacks on the Wintry weather Olympics. President Vladimir Putin, who has staked his status on February’s Sochi video Games and brushed aside threats from Chechen and different Islamist militants within the neighborhood North Caucasus, ordered tighter security nationwide after the morning rush-hour blast. Investigators stated they believed a male suicide bomber activate the blast, a day after a similar assault killed as a minimum 17 in the primary rail station of a metropolis that serves as a gateway to the southern wedge of Russian territory bounded by way of the Black and Caspian Seas and the Caucasus mountains. “What are we purported to do, just walk now?” The bomb used was once filled with “an identical” shrapnel to that in the rail station, indicating they will were made in the identical situation and assisting suspicions the bombings have been linked, mentioned Vladimir Markin, a spokesman for the investigators.