At least 10 people were killed and 47 injured in a blast at a St. Petersburg metro on Monday, in what Russia's general prosecutor has officially declared a terror attack.
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Interfax news agency quoted unnamed sources as saying that the explosive device had been left in a briefcase on the metro carriage and had been filled with shrapnel.
Russia's anti-terrorism committee has since said a second explosive device was found and detonated at a different location from where the earlier blast took place. All St. Petersburg metro stations were closed following the blast.