Moscow: At least ten people were killed and several others injured in an explosion inside a metro train at the Sennaya Square station in Russia's St. Petersburg.
According to the reports, an unidentified device exploded in a train car.
Evacuation is under way at a blast-hit subway station. Rescue workers and law enforcement personnel are working at the scene.
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Seven metro stations in the city have been closed following the blast.
Meanwhile, President Vladimir Putin has been informed about explosion. (ANI)