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What is ISIS-K, the group that claims it carried out the Moscow concert attack?

03:42
Firefighters work in the burned concert hall after an attack on the western edge of Moscow, Russia. ISIS-K has claimed responsibility for the attack. (Investigative Committee of Russia via AP)
Firefighters work in the burned concert hall after an attack on the western edge of Moscow, Russia. ISIS-K has claimed responsibility for the attack. (Investigative Committee of Russia via AP)

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