Olympic Fears Mount as 2nd Blast Rocks Russia Officials believe Volgograd bombings linked By Rob Quinn, Newser Staff Posted Dec 30, 2013 5:56 AM CST Updated Dec 30, 2013 7:58 AM CST 27 comments Comments Wreckage of a trolleybus sits in Volgograd, Monday, Dec. 30, 2013. The blast was probably carried out by bombers from the same organization behind a train explosion a day earlier. (AP Photo/Denis Tyrin) (Newser) – A second major terrorist attack in the space of 24 hours has shaken the Russian city of Volgograd, less than six weeks before the start of the Sochi Olympics. Authorities say at least 14 people were killed in an apparent suicide attack on an electric trolleybus close to a hospital where victims of yesterday's suicide attack in a railway station were being treated, the Guardian reports, describing a "disfigured" bus left without a roof or walls. Another 41 have been injured, reports RT. Officials say they believe the two attacks are linked, though no group has claimed responsibility. But the Guardian notes that security experts are drawing a link between the attacks—which now number three in three months—to Chechen jihadist leader Doku Umarov, who has vowed to interfere with the Games. RT notes a Volgograd basketball game scheduled for next Monday has pre-emptively been canceled over security fears.