Moscow concert hall attack: Russia detains 11 after deadly shooting that has been claimed by Islamic State

Militant Islamist group Islamic State claimed responsibility for Friday's attack, the deadliest in Russia for 20 years. But there were indications that Russia was pursuing a Ukrainian link, despite a statement from Ukrainian presidential adviser Mykhailo Podolyak that Kyiv had nothing to do with it. The FSB security service said "all four terrorists" had been arrested while heading to the Ukrainian border, and that they had contacts in Ukraine. It said they were being transferred to Moscow.

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