At least 34 people were killed in apparent suicide bombings in the Russian city of Volgograd—the first at the central commuter station Dec. 29, the next the following day on a trolley-bus in a market district. Moscow is stepping up security throughout the country, fearing an effort to disrupt the 2014 winter Olympic Games slated for the Black Sea coastal city of Sochi in February. Police have detained dozens in a sweep of terror suspects in Volgograd, with hundreds more searched or questioned. Reports did not make clear if the detained are Chechens, but did note a threat in a video statement released by Chechen resistance leader Doku Umarov earlier in the year to use "maximum force" to stop the Sochi Olympics. On the day of the first Volgograd blast, Russia's National Anti-Terrorist Committee boasted that FSB troops had killed a close aide to Umarov in a raid on a safe house in Dagestan. (CNN, Dec. 31; BBC News, The Guardian, Dec. 30; RT, Dec. 29)