Originally published on December 30, 2013

At least 15 people were killed and 23 wounded when a bomb went off on a trolleybus in the city of Volgograd, Russia on Monday (December 30).

According to the RT, the bomb may have been planted in the central part of the trolley bus rather than brought onboard by a suicide bomber. The explosion was reportedly set off when the bus was near a busy market in the city's Dzerzhinsky during morning rush hour

The explosion came only a day after a suicide bomb attack killed at least 17 people in the main railway station in the same city.

According to CNN, the Russian authorities have labelled the two incidents as 'terrorist attacks'. However, no one has yet claimed responsibility for the explosions.

Russia is set to hold the Winter Olympics in the Black Sea resort of Sochi, some 690 kilometers southwest of Volgograd, starting on February 7. According to Russia, insurgents who want to carve an Islamic state out of the southern Russia have claimed that they will use maximum force to prevent the games from being held.

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