The suburban Moscow concert hall assault last Friday that killed more than 130 people was the deadliest attack inside Russia in 20 years. It raised major questions about the capabilities and ambitions of the terror group that U.S. officials believe was responsible: ISIS-Khorasan, or ISIS-K, an affiliate of the self-declared Islamic State that emerged in Afghanistan.
In multiple documentaries over the years, FRONTLINE has examined how ISIS-K established a foothold in Afghanistan and emerged as a threat. Explore our collected reporting, available to stream now.
Explore FRONTLINE’s broader reporting on ISIS and the fight against the terror group in The Secret History of ISIS, The Rise of ISIS, Confronting ISIS and many other documentaries.