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The Islamic State group claimed responsibility. A U.S. official told The Associated Press that U.S. intelligence had confirmed the group's claim.

United statesSmolenskaya oblastAntonio guterresMichael balsamoVladimir putinRussia federal security serviceUn security councilAssociated pressFederal security servicePresident vladimir putinTass relatedSaturday imagesCrocus city hallIslamic stateGeneral antonio guterresSoviet union