Inside barbaric ISIS-K splinter cell behind Moscow massacre who slaughter children

The U.S. has intelligence confirming Islamic State's claim of responsibility for a deadly shooting attack at a concert near Moscow on Friday (March 22) by a rising affiliate known as Islamic State Khorasan. Better known as ISIS-K, the group is named after an old term for the region that included parts of Iran, Turkmenistan, and Afghanistan. It emerged in eastern Afghanistan in late 2014 and quickly established a reputation for extreme brutality. Experts say ISIS-K has become fixated on Russia in recent years, seeing it as complicit in activities that it says oppresses Muslims. Read more: ---Contents of this video --- - Views from outside the concert hall with smoke rising - Dan Byman, a senior fellow with the Transnational Threats Project at the Center for Strategic and International Studies in Washington, D.C. explains what ISIS-K is - “ISIS-K has become one of th