Trolley bus blast kills at least 10 in Russia's Volgograd

At least 10 people were killed and 10 others injured early Monday when an explosion hit a trolley bus in Russia's Volgograd, the second fatal blast within two days.

Russian Investigation Committee spokesman Vladimir Markin said the fresh explosion could also be a terror attack, resembling the Sunday blast in the city's railway station that left at least 16 dead and more than 40 injured. A criminal case under the act of terrorism and illegal turnover of explosives has been opened.

The Emergency Situations Ministry has sent a plane with medical modules onboard to attend the victims of the new explosion.