LastNews: Another explosion at a train station in Russia

Another outbreak occurred in Russia Vollgograd. A day after 17 people died after an explosion at a train station, 15 people were killed in an attack near a market in the district of Dzerzhinskit.
The bomb was placed in a trolebuz filled with passengers who were going to work. The explosion destroyed the vehicle and broke the windows of surrounding houses.
A spokesman for the group said that Russian investigative bombings last two days being treated as terrorist acts. So far, no group has claimed responsibility of the attacks in Vollgograd.
Moscow is concerned that different militant groups are increasing more and more of their activity within the Winter Olympics to be held in Sochi, in 2014.
Throughout Russia have strengthened security measures at train stations and airports.