The federal Investigative Committee, Russia's equivalent to the US FBI, said one police officer was among the dead. A nine-year-old child was also injured, it added in a statement.
"A suicide bomber who was approaching a metal detector saw a law enforcement official and, after growing nervous, set off an explosive device," the Investigative Committee statement said.
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"A suicide bomber who was approaching a metal detector saw a law enforcement official and, after growing nervous, set off an explosive device," the Investigative Committee statement said.
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