MOSCOW (AP) - Russian officials say at least 13 people were killed and scores were wounded Sunday by a suicide bomber at a railway station in southern Russia, heightening concern about terrorism ahead of February's Olympics in the Black Sea resort of Sochi.
The National Anti-Terrorist Committee said the explosion at the central railway station in the city of Volgograd was set off by a suicide bomber.
Vladimir Markin, a spokesman for the nation's top investigative agency, the Investigative Committee, said that at least 13 people died in the blast. Russia's Health Ministry said about 50 people were injured.
No one immediately claimed responsibility for Sunday's attack, but it came several months after Chechen rebel leader Doku Umarov called for new attacks against civilian targets in Russia, including the Sochi Games.
(Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)