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Islamic State group claim of Moscow concert attack 'credible', researcher says Russia observed a national day of mourning on Sunday (March 24) as investigators said the death toll from Friday's massacre in a concert hall near Moscow had risen to at least 137, making it the deadliest attack in Europe to have been claimed by the Islamic State (IS) group. For more analysis, FRANCE 24 is joined by Collin P. Clarke, Senior Research Fellow at The Soufan Center.