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

ISIS Khorasan was one of the first branches [in central Asia] to pledge allegiance to ISIS, adopting a radical Islamic worldview more militant and uncompromising than its rivals, including al-Qaida and the Taliban.
The group's leaders are still based largely in eastern Afghanistan and Pakistan. But according to experts at the Center for Strategic and International Studies, the group has been working to expand its operations across the 'Khorasan' region.
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